How you Feel When You Are 1 Week Pregnant

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How you Feel When You Are 1 Week Pregnant

NOTE: This post contains affiliate links of Recommended products that when you purchase any product through the link provided, I will earn a commission at a no cost which will suport my work as a blogger to produce more educative posts like this one.

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You’ve probably heard that pregnancy is counted from the first day of your last period.

Doctors do this because it’s very difficult to accurately measure the exact day of conception.

This means that during week 1, you were actually not pregnant yet, but your body was already preparing for this event.

Although this week is considered to be the first week of pregnancy, you were actually on your period.

Your baby won’t be conceived during the first two weeks of pregnancy!

Like we said before, the first week of pregnancy isn’t measured from the date you conceive.

As a rule, the estimated delivery date is calculated by the gynecologist from the first day of the last menstruation, since it is often impossible to determine the exact day of conception.

It occurs approximately 2 weeks later during ovulation.

Pregnancy is calculated this way because, even if you know the exact date when you ovulated — a lot of women don’t — it’s still very difficult to be certain of the moment in which your baby was conceived.

Especially if you’re trying to get pregnant, you’ll probably be having intercourse several times around your ovulation.

So by the time you miss your period and find out you’re pregnant, you’ll probably be around 4 weeks pregnant!

Your baby at week 1 of pregnancy

Believe it or not, there’s no baby yet during your first week of pregnancy.

During the first days of pregnancy, the egg that will be released — and hopefully fertilized — is starting to mature inside your ovaries.

During your period, around 20 eggs or ova are still inside their ovarian follicles, and they start to prepare for next month’s ovulation.

Only one, or occasionally two, eggs will actually be released into the fallopian tubes each cycle to be fertilized.

How big is your baby at 1 week pregnant?

While there’s no baby to be measured yet, your body is preparing itself for pregnancy.

A woman’s egg is the largest single cell in the human body, and it begins to mature even during the first week of pregnancy.

This process is called the ovarian cycle, and during the first days of pregnancy, you’ll be entering the follicular phase.

The beginning of this phase coincides with the start of your period.

At first, a hormone called FSH or follicle stimulating hormone causes many immature follicles to begin preparing for ovulation.

But by days 5 to 7 of your cycle, one egg has become dominant.

The dominant egg usually has a stronger blood supply and produces more estrogen.

Estrogen will also stimulate the thickening of your uterine lining.

During the follicular phase, this dominant egg matures and then waits for ovulation.

Pregnancy week 1 fetal development

Since the conception hasn’t happened, there’s still no fetal development during the first week of pregnancy.

However, that doesn’t mean that you can’t start working towards a healthy pregnancy.

Your egg and the father’s sperm are already gearing up for pregnancy.

Having a healthy pregnancy largely depends on the quality of these two cells, which have to contain 23 chromosomes each.

These 23 chromosomes contain all of your and your partner’s genetic information.

When all 46 chromosomes are combined, you get a baby!

Even if there’s no baby yet, creating healthy lifestyle habits and taking prenatal vitamins before pregnancy can maximize your chances of conceiving a healthy baby.

Your body at week 1 of pregnancy

During the first week of pregnancy, you’re actually going through your last menstruation before the baby.

Since your estimated gestational age will be counted from the first day of your last period, technically the first day of your pregnancy will be the same as the day when you start menstruating.

During these days, your body will be getting rid of last month’s egg and uterine lining.

Especially during the first two days of pregnancy — or the first two days of your period — most women experience a heavier menstrual flow.

This will help your body prepare for a new cycle.

Once your period ends, a new egg will already be maturing, and your uterine lining or endometrium will start to thicken again.

This lining is where the fertilized egg will implant itself after conception, ready to start growing.

Week 1 pregnant belly

There won’t really be a baby bump during the first week of your pregnancy, or really, for the next few weeks.

Since you’ll be menstruating during this week, it is possible that hormonal changes might make you feel a bit bloated due to fluid retention

Other women experience cramps during their menstruation or abdominal tenderness.

Every woman has different symptoms during their period, and this one shouldn’t be any different from your previous menstruations

Week 1 pregnant symptoms

Since conception hasn’t occurred yet, you won’t experience pregnancy symptoms from day 1.

For many women, their first real symptom of pregnancy comes a month later when they miss their period.

But you might experience menstrual symptoms during the first days of pregnancy.

Some of the most common menstrual symptoms include:

  • uterine cramps
  • breast tenderness
  • back pain
  • headaches
  • mood changes
  • acne or pimples
  • fatigue
  • diarrhea or constipation

Week 1 pregnant ultrasound: do you need it?

You don’t really need an ultrasound during the first week of pregnancy.

However, your doctor might perform one if you haven’t had a pre-conceptional checkup or if you’ve had trouble conceiving.

At this point, an ultrasound can help diagnose anatomical abnormalities that might make it harder for you to conceive, such as fibroids or polycystic ovarian syndrome.

Week 1 pregnant lifestyle

If you’re trying to conceive, there are many lifestyle changes you can adopt to improve your chances of getting pregnant.

Some of these new habits include:

Starting a healthier diet: there isn’t a specific fertility diet, but eating healthier foods can help you get pregnant faster.

Include foods like leafy greens, mercury-free fish, seeds and nuts, complex carbs, fruits, and plenty of water in your diet to prepare your body for a healthy pregnancy.

Avoid certain substances: even if you’re not technically pregnant, staying away from alcohol, tobacco, excessive caffeine, simple carbs, trans fats, and environmental pollutants can improve your chances of having a healthy baby.

Start exercising: it’s never too late to get healthy once you’ve decided you want a baby.

Exercising is a great way to reach a healthy weight before a baby!

Get enough sleep: studies have shown that women who don’t get enough sleep can have more trouble getting pregnant.

Track your cycle: use a menstrual calendar like Flo to determine exactly when your cycle begins, how many days it lasts, and the approximate date of your ovulation.

Sex at week 1 of pregnancy

Most women aren’t on their fertile window during their period, and during the first week of pregnancy you’ll still be around 14 days away from ovulation.

But that doesn’t mean you can’t start practicing!

Sperm can live up to 5 days inside the uterine cavity, so even having sex a few days before ovulation can result in a pregnancy.

Once you’ve decided you’re ready to conceive, avoid using lubricant.

Some lubricants can change the pH inside your vagina and make it harder for sperm to swim.

Week 1 pregnant checklist

Even before conception, these are some things you can do to make sure your body is in top shape for a pregnancy:

start taking prenatal vitamins before pregnancy
track your menstrual cycle

set up a pre-conceptional visit with your doctor
quit smoking

reduce your caffeine intake

start exercising
get plenty of sleep
eat healthier foods
gather your and your partner’s family histories

What to ask your doctor?

If you’ve decided you’re ready to try for a baby, it’s time to get a pre-conceptional checkup.

Your doctor can advise you on any necessary lifestyle changes, which are the best prenatal vitamins before pregnancy, and how to calculate your estimated delivery date.

If you’re tracking your cycle, this information can help your doctor determine these dates.

Pregnancy is commonly divided into 3 terms, each of which takes a little more than 13 weeks.

Full-term babies are born from 39 weeks to 40 weeks and 6/7 weeks of gestation.

And if you’re pregnant with twins, it is advisable to deliver twins at 38 completed weeks’ gestation or later to avoid neonatal complications.

Keeping track of your cycle will allow your doctor to be certain of these dates even before the first ultrasound.

Even though there’s no baby during the first week of pregnancy, your body is already preparing itself for conception.

That means that there are already many things you can do to improve your chances of having a healthy pregnancy.

Follow a healthy lifestyle during the first days of pregnancy and you’ll be taking care of your baby even before it’s here!


Surprise! One week pregnant is actually not pregnant at all. Say what?!

Most OBs count pregnancy starting from the first day of your last period.

That’s because ovulation and conception are really tough to pinpoint, but the physical signs of menstruation are much easier to spot.

So in doctor speak, 1 week pregnant means you’re on your period and not yet pregnant.

You won’t actually conceive your baby until week two or three, depending on the length of your cycle.

If you’ve just found out you’re expecting, you might think this is your first week of pregnancy, but you’re probably around 4 weeks pregnant.

Yes, already! (Your OB will give you a more accurate estimate when you go in for your first prenatal appointment.) Skip ahead and check out week 4.


At 1 week pregnant—remember at this early stage, the symptoms you’re experiencing are those typical to your period because you’re not actually pregnant.

These symptoms may last from three to seven days, and can include:

Vaginal bleeding. You body is shedding the uterine lining, which holds last month’s unfertilized egg.

Lower back pain and cramps.

To release that lining, your uterus contracts, causing your back and abdomen to ache.

Bloating. Fluctuating hormones can give you a bloated belly right before and during your period.

Mood swings. Those raging hormones can also cause irritability and wreak havoc on your emotions.

Many women complain of menstrual migraines, which are also hormone related.

(Surprise, surprise.) Ice packs, OTC pain relievers, and relaxation exercises may help ease the pain.


Inside your 1 week pregnant belly, your body isn’t only releasing last month’s egg.

It begins to form a new uterine lining, which will hold next month’s egg. You know, the one that will hopefully get fertilized and grow and develop into a fetus?!

Cool fact: Human eggs are the largest cells in the body. An egg is the size of peach fuzz.

Your body will release one (or in rare cases, two) eggs somewhere between day 10 and day 19 of your menstrual cycle—or about 14 days before your next period is expected.

It can be fertilized for about 12 to 24 hours after that. Oh, and having sex before then is helpful too, since sperm can live in your body for up to six days.

The first signs of pregnancy won’t occur right away—in fact, many women miss their period at week 4 before they even feel “different.” But some common early signs of pregnancy in the first weeks after fertilization include breast soreness or tenderness, nausea, fatigue, and frequent urge to pee.

At one week pregnant (a.k.a.

hoping to be pregnant soon!), you’re probably thinking about how you can prep your body to carry a baby.

It’s a good idea to start pregnancy at a healthy weight and free of bad habits such as smoking and drinking.

Reduce your caffeine intake to the equivalent of a cup of coffee or two (we’re talking 8 ounce cups—not the venti!) per day.


You’re not likely to have a 1 week pregnant ultrasound.

But if you’ve been trying for a while to get pregnant and have seen a fertility specialist, you may have had an ultrasound to check for fibroids, to see how many follicles (which grow into eggs) are in your ovaries and/or to gauge the thickness of your uterine lining.

If there are any problems, your doctor can prescribe a fertility treatment that can help you conceive.

Now, get ready to have some sex. You’ve got a baby to make!

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18 thoughts on “How you Feel When You Are 1 Week Pregnant”

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