At 5 weeks pregnant, you’re now in month 2 of your pregnancy. This week, you can officially take a pregnancy test — your hCG hormone levels are high enough to show a positive result, and you may have early symptoms like fatigue and nausea.

As for your baby? The embryo is starting to look more like a fetus, and your little one's heart and circulatory system are developing.

Your Baby at Week 5

At a Glance

The placenta forms
The placenta forms
The placenta is under construction and will finish forming by the end of the first trimester. It’s an organ that will soon connect your developing fetus to your uterine wall, providing baby-to-be with nutrients and oxygen.
Positive pregnancy test
Positive pregnancy test
Your hCG hormone levels are now high enough to confirm you're having a baby in a home pregnancy test.
From embryo to fetus
From embryo to fetus
That mass of cells we call an embryo is starting to look like a fetus, with a forming neural tube (pre-spinal cord and brain) running from head to rump.

5 weeks pregnant is how many months?

If you're 5 weeks pregnant, you're in month 2 of your pregnancy. Only 7 months to go! Still have questions?  Here's some more information on how weeks, months and trimesters are broken down in pregnancy.

How big is my baby at 5 weeks?

At 5 weeks pregnant, your little embryo is still super tiny, measuring about the size of an orange seed. 

Baby has a tail

So what does your baby look like now? Actually, not unlike a tadpole, with a rudimentary head and a tail. But don't worry, there's no frog in your future.

In fact, you're fewer than eight months away from holding a real prince or princess in your arms. While all this is happening, the hCG hormone levels in your body are now high enough to confirm that you're expecting using a home pregnancy test. Go to the doctor to confirm the good news and figure out your due date.

Organs are forming

It takes a lot of developing to become a baby — all the major and minor bodily systems (digestive, circulatory, nervous and so on) and organs, like the heart, lungs and stomach, have to form from scratch.

When you're 5 weeks pregnant, a tiny tube-like structure is beginning to develop into your baby's heart, though he almost certainly has his grip on yours already!

Also in the works this week are several other organs, including the neural tube — the precursor to your baby's brain and spinal cord — which hasn't yet sealed. But by next week, that open-door policy is over.

Your Body at Week 5

5 weeks pregnant woman

HCG and home pregnancy tests

By now you should have missed your period — one of the more obvious indications that you're pregnant. It's time to pee on a stick (good news since you probably need to go more often anyway), because at 5 weeks pregnant the level of hCG, the pregnancy-announcer hormone, in your urine is high enough to be detected by a home pregnancy test.

That means you'll be able to confirm what you probably already suspect: You're expecting!

This news will probably elicit a combo platter of emotions ranging from sheer joy to sheer terror as the reality that you're going to be a mom sets in. Mood swings are totally normal — kind of like PMS on overdrive — so don't worry if you're having them.

Early pregnancy signs

There'll be other early pregnancy signs, too. Like that sense of exhaustion that may have washed over you. And those tender breasts. Or that slight bout of nausea you might have felt when you smelled a dish that normally doesn't bother you.

Growing a baby — even one no larger than an orange seed — is hard work, and your body is responding in kind.

Pregnancy hormones kick in

Large quantities of hormones — chemical signals that circulate in your body and work together to cause physical changes — are being mass-produced this week.

Among them are estrogen, which keeps the levels of progesterone and hCG up where they need to be; progesterone, which maintains the function of the placenta, keeps the smooth muscles of the uterus from contracting, and stimulates breast tissue growth; and hCG, which support the corpus luteum until the placenta takes over at about 10 weeks and regulates the amount of progesterone necessary.

And don't be surprised if you feel like these hormones are taking over your life sometimes! You can download the What to Expect app to follow these changes to your body during pregnancy.

Telling your friends you're pregnant

Have you or your partner been bursting to spread the good news about your expectant status ever since that home pregnancy test turned positive? Not sure when the best time is to grab a megaphone (or a telephone ... or a computer keyboard) and start sharing? Only you can make the call, so to speak, on that one.

Some women (and their partners if they have them) can't wait to tell their friends they're pregnant — if they could, they'd shout it from the highest mountain or make the announcement go viral — while others prefer to keep their happy news on the DL until after the third month, when the risk of miscarriage greatly decreases.

Still others wish that they could stay mum about becoming a mom (or dad ... or second parent of any kind) but can't help blabbing the first chance they get. Talk to loved ones for advice, and remember, it's your little secret for as long as you choose.

Learn more about spreading the news.

Pregnancy Symptoms Week 5

Food cravings and aversions
Food cravings and aversions
Fatigue
Fatigue
Nausea
Nausea
Excessive saliva
Excessive saliva

Tips for You This Week

Are your hCG levels normal?

If your doctor ordered you a blood test to confirm your pregnancy, you may have learned what your hCG levels are — and may be wondering whether those levels are normal. 

Just know that every pregnant woman’s hormone levels are different, and can fluctuate even from day to day. Some expecting moms have almost no measurable levels of hCG early on, while others have readings of more than 400 milli-international units per milliliter (mIU/mL). 

As long as your doctor confirms that your pregnancy is progressing on track, you don’t have to worry about the numbers.

Find your IVF due date

If you conceived via in vitro fertilization (IVF), your pregnancy due date will depend whether you had a three-day embryo transfer or a five-day embryo transfer.

If you had a three-day transfer, add 263 days from your transfer date to calculate your due date; if you had a five-day transfer, count 261 days from your transfer date. Or, let our IVF due date calculator do the work for you.

Avoid smoking and vaping

There’s no amount or type of smoking — whether that’s conventional cigarettes or e-cigarettes — that’s been shown to be safe during pregnancy. 

Traditional cigarettes can not only lower fertility levels, but they also contain thousands of toxic chemicals that may not be safe for you or baby.

And both traditional and e-cigarettes deliver nicotine, which can be harmful to baby’s brain and lungs, and increase the risk of problems such as miscarriage and preterm birth. Even secondhand smoke could be potentially dangerous to you and your baby.

If you’re having trouble quitting on your own, talk to your doctor about whether you’re a candidate for nicotine replacement therapy; it may be safe to use certain nicotine-containing patches or medications if you’re under the care of a doctor.

Take some exercise precautions

Exercise may do a pregnant body good, but if the thought of going to spin class sends your stomach spinning, save the workout for another day. 

Even if you aren’t experiencing morning sickness and fatigue, now isn’t the time to go overboard. Maintain your fitness levels rather than increasing them.

While vigorous exercise is usually okay for pregnant women, try to keep the intensity to a 13 to 14 on a max scale of 20. You should feel energized — not drained — after a workout.

Learn how to manage bloat

Feeling gassy? Gas and bloating can be very early signs of pregnancy, but they can also be a sign that you’re ovulating (or just PMSing). 

Whatever the reason, you probably aren’t in the mood to eat your veggies, as healthy as they may be. Opt instead for produce that won't bring on the bloat — for example, mangoes instead of broccoli or strawberries instead of cabbage.

Another simple way to deflate pregnancy tummy bubbles: Instead of sparkling water, sip plain water instead.

Healthy fats are good fats

Healthy fats — like omega-3 fatty acids — aren’t just essential for your baby’s developing brain. They can also boost your partner’s fertility by increasing his sperm count and sperm motility. Saturated fats, on the other hand — like the kind found in fast food — can sabotage sperm by making them less hardy.

You can get omega-3s in pregnancy-safe fish such as trout and wild salmon and from certain fortified foods, including eggs, yogurt and milk. If you can't stomach fish, you can also find omega 3s in prenatal vitamins and supplements.

Are you pregnant with twins?

If you have a sneaking suspicion that there are two babies on board, you may be right. While you won’t know for sure until the first trimester ultrasound, which is usually done between 6 and 9 weeks, there are some signs that you’re carrying multiples.

For starters, you may have morning sickness that starts earlier (and lasts longer), thanks to the elevated levels of the hormone hCG in your body. You may also be more fatigued than ever, since your body is busy growing two babies instead of one.   

If you are pregnant with multiples, you can expect more weight gain, earlier — to the tune of about a pound a week in the first trimester — and an increased appetite. Eating for three, anyone?

From the What to Expect editorial team and Heidi Murkoff, author of What to Expect When You're Expecting. What to Expect follows strict reporting guidelines and uses only credible sources, such as peer-reviewed studies, academic research institutions and highly respected health organizations. Learn how we keep our content accurate and up-to-date by reading our medical review and editorial policy.

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  3. WhatToExpect.com, Prenatal Vitamins and Nausea, January 2022.
  4. WhatToExpect.com, Morning Sickness and Nausea During Pregnancy, December 2022.
  5. WhatToExpect.com, What to Do About Bloating During Pregnancy, February 2021.
  6. WhatToExpect.com, Exercises to Avoid During Pregnancy, November 2021.
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  12. American College of Obstetricians and Gynecologists, Early Pregnancy Loss, May 2023.
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  24. WhatToExpect.com, How Many Weeks, Months and Trimesters in a Pregnancy?, May 2022.
  25. WhatToExpect.com, Pregnancy Due Date Calculator and Conception Calculator, September 2023.
  26. WhatToExpect.com, When to Tell People You're Pregnant, June 2021.
  27. WhatToExpect.com, HCG Levels During Pregnancy: What Is Normal?, May 2021.
  28. WhatToExpect.com, Your Guide to Pregnancy Hormones, November 2022.
  29. WhatToExpect.com, Food Cravings and Aversions During Pregnancy, April 2021.
  30. WhatToExpect.com, Excess Saliva During Pregnancy, September 2022.
  31. WhatToExpect.com, IVF Due Date Calculator, June 2023.
  32. WhatToExpect.com, Smoking Cigarettes During Pregnancy: Is It Ever Safe?, September 2022.
  33. WhatToExpect.com, Are E-Cigarettes and Vaping Safe While Pregnant?, December 2021.
  34. WhatToExpect.com, The Best Pregnancy Workouts and Exercises You Can Do While Expecting, July 2021.
  35. WhatToExpect.com, Fatigue During Pregnancy, November 2022.
  36. WhatToExpect.com, Omega-3 Foods and Fish Oil During Pregnancy, November 2021.
  37. WhatToExpect.com, Are There Signs You're Pregnant With Twins?, December 2021.

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