In week 4 of pregnancy, your body is beginning to form the placenta and amniotic sac.

(But if you don’t notice any symptoms at all yet, that’s completely normal too.

Only 8 months to go!

Your baby at week 4

You might feel a little pressure in your abdomen (nothing to worry about!)

This is usually a sign that the embryo has implanted itself into the uterine wall.

Dont have any spotting at all?

Your baby at week 4

(And no, a standard multi wont do.)

Doing the math is actually a lot easier than you think even if you slept through high school algebra.

After all, it is just an estimate.

Your baby at week 4

The catch: That assumes youre having sex regularly two to three times a week and without contraception.

If youre 4 weeks pregnant, you’re in month 1 of your pregnancy.

Only 8 months to go!

Your baby at week 4

Here’s some more information onhow weeks, months and trimesters are broken down in pregnancy.

How big is my baby at 4 weeks?

Your Body at Week 4

No symptoms yet?

poppy seed

Just a week after fertilization, baby-making is still in its infancy, so to speak.

Chances are you’re oblivious to all the hubbub.

You might feel a little pressure in your abdomen (nothing to worry about!)

poppy seed

(And no, a standard multi wont do.)

Prenatals contain vitamins and minerals that are essential for your growing baby.

Doing the math is actually a lot easier than you think even if you slept through high school algebra.

Two sets of cells

Your estimated due date is 40 weeks from the first day of your last period.

Regardless, you shouldn’t plan your schedule around your estimated due date.

After all, it is just an estimate.

Two sets of cells

Only a handful of babies actually make their debuts right on schedule.

As upsetting as this may be, it wont impact your ability to get pregnant in the future.

Priority number one is having a healthy baby.

Two sets of cells

In general, healthy couples have a 20 to 25 percentchance of getting pregnantduring each months cycle.

The catch: That assumes youre having sex regularly two to three times a week and without contraception.

About 85 percent of couples who are trying to conceive will get pregnant within a year.

Two sets of cells

Many women dont experience any symptoms of implantation, but some will feel abdominal cramps andlight bleeding.

Whether you feel anything or not, implantation marks the beginning of your pregnancy.

It wont be long now!

Two sets of cells

Drugstore pregnancy testsarent always cheap, but theyareup to 99 percent accurate.

Prices and details are accurate as of the published date.

We may earn commissions from shopping links.

Two sets of cells

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What Other January 2026 Moms Are Talking About

Two sets of cells

Two sets of cells

Two sets of cells

Seeing double

Seeing double

Seeing double

Baby’s yolk sac

Baby’s yolk sac

Baby’s yolk sac

baby size at 4 weeks pregnant

baby size at 4 weeks pregnant

Implantation bleeding

Implantation bleeding

Implantation bleeding

Implantation bleeding

Implantation bleeding

PMS-like symptoms

PMS-like symptoms

PMS-like symptoms

PMS-like symptoms

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Best Prenatal Vitamins - Nature Made Prenatal

Best Prenatal Vitamins - Nature Made Prenatal

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$2,000 Cowboy Boots and Fancy Watches — Do Dads Deserve Push Presents, Too?

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