How many months is 6 weeks pregnant?

6 weeks pregnant puts you in month 2 of pregnancy. Month 2 covers weeks 5 to 8. Providers count in weeks; months are approximate.

How big is the baby at 6 weeks?

At 6 weeks, the baby is about the size of a lentil, roughly 0.6 cm long. That is an average; healthy babies vary.

Is spotting normal at 6 weeks pregnant?

Light spotting is common. In a US study of more than 4,500 pregnancies, about 1 in 4 women had some bleeding in the first trimester, most often between weeks 5 and 8, and most episodes lasted less than 3 days. In that study, women who bled miscarried no more often than women who didn't (12% vs 13%). Still, call your provider if bleeding is heavy like a period, or comes with strong cramps, pain on one side, shoulder-tip pain, or feeling faint.

Is it normal to have no symptoms at 6 weeks pregnant?

Yes. Many people feel little or nothing at 6 weeks. Nausea most often starts around week 6, but for some it begins later, and some people never get it. Having no symptoms is not, on its own, a sign that something is wrong. The only way to check how a pregnancy is growing is a scan or blood tests, not how you feel.

Why do I have cramps at 6 weeks pregnant?

Mild, period-like cramps are common as the uterus starts to grow. They usually come and go and ease when you rest. Call your provider promptly if cramps are severe, stay on one side, or come with bleeding, fever, shoulder-tip pain or dizziness. These need checking to rule out an ectopic pregnancy or a miscarriage.

What is the chance of miscarriage at 6 weeks pregnant?

About 10 in 100 known pregnancies end in miscarriage, mostly in the first 13 weeks. Seeing a heartbeat lowers the odds a lot. In a study of nearly 700 women with no symptoms whose scan showed a heartbeat, 9.4% of those scanned at 6 weeks later miscarried, compared with 4.2% at 7 weeks and 1.5% at 8 weeks. About half of early losses happen because the embryo has an abnormal number of chromosomes. Working, exercise, stress and sex do not cause miscarriage.

Are there signs of a boy or girl at 6 weeks pregnant?

No. Symptoms, cravings and how sick you feel do not predict the baby's sex. Heart rate doesn't either: a study of 477 pregnancies found almost the same first-trimester heart rate for girls (about 152 beats per minute) and boys (about 155). A blood test called cell-free DNA screening can report sex chromosomes from 10 weeks, and the anatomy scan can usually show sex at around 18 to 22 weeks.

6 Weeks Pregnant

At 6 weeks pregnant, the embryo is only about 6 mm long, but this is the week many people first see a heartbeat on a scan. Pregnancy is counted from the first day of your last period, so you conceived about four weeks ago, and your period is roughly two weeks late. Hormone levels are rising fast. That is why nausea, tiredness, sore breasts and needing to pee often start around now — or don't yet, which is also common. This page covers what a 6-week ultrasound can and can't show, why your belly may already feel bigger, what spotting and cramping usually mean at this stage, and when to call your provider.

What trimester is 6 weeks?

Week 6 is in the first trimester, which runs from week 1 to week 12. The second trimester starts at week 13, 7 weeks from now.

Week 6 — first trimester, month 2; 34 weeks to go until your due date.
Baby's size — about a lentil, ~0.6 cm.

Not sure it's 6 weeks? Try our due date calculator.

★ The heartbeat begins.

How big is your baby at 6 weeks?

Size of a

lentil

Length, head to bottom

~0.6 cm

Weight

—

Up from a sesame seed last week to a lentil now.

Baby development at week 6

A major milestone: the heart has started to beat, and from about 6 weeks it can often be seen as a flicker on a vaginal ultrasound, at first around 110 beats per minute. Tiny buds that will become arms and legs appear, and the face begins to take shape with dark spots marking where the eyes will be. The embryo has a distinct C-shaped curve and is roughly the size of a lentil.

What an ultrasound shows at 6 weeks

A scan this early is usually done through the vagina (a transvaginal scan), because the embryo is still too small to see well through the belly. It can show the gestational sac, the yolk sac that feeds the embryo for now, and a tiny embryo a few millimetres long.

The flicker of the heart often becomes visible around now. In one study of 363 normal pregnancies, it was first seen at 40 days (5 weeks 5 days) and was visible in every case by 46 days (6 weeks 4 days). The rate starts slow, around 110 beats per minute in the first days it can be seen, and climbs to about 170 by week 9.

If a 6-week scan shows no heartbeat yet, that alone does not mean something is wrong. Your dates may be a few days off, especially if you ovulated later than day 14. Doctors usually repeat the scan 7 to 14 days later before drawing any conclusion. Many people don't have a scan this early at all: routine first scans are usually done between 8 and 14 weeks.

Your body at 6 weeks

Nausea and vomiting may intensify
Strong fatigue
Sore breasts and darkening areolas
Mood swings from hormonal shifts

Your belly at 6 weeks

There is no baby bump to see at 6 weeks. The uterus is still small and sits low inside your pelvis. If your jeans already feel tight, bloating is the likely reason: the hormone progesterone relaxes the muscles of your gut, which slows digestion and causes gas and a puffy belly.

Mild, period-like cramps are also common as the uterus starts to grow. They usually come and go and ease with rest.

Tips for week 6

Try ginger for nausea, and ask a pharmacist or doctor before taking any supplement for it
Stay hydrated, especially if vomiting
An early ultrasound may detect the heartbeat around now

6 Weeks Pregnant: your questions

What trimester is 6 weeks?: Week 6 is in the first trimester, which runs from week 1 to week 12. The second trimester starts at week 13, 7 weeks from now.
How many months is 6 weeks pregnant?: 6 weeks pregnant puts you in month 2 of pregnancy. Month 2 covers weeks 5 to 8. Providers count in weeks; months are approximate.
How big is the baby at 6 weeks?: At 6 weeks, the baby is about the size of a lentil, roughly 0.6 cm long. That is an average; healthy babies vary.
Is spotting normal at 6 weeks pregnant?: Light spotting is common. In a US study of more than 4,500 pregnancies, about 1 in 4 women had some bleeding in the first trimester, most often between weeks 5 and 8, and most episodes lasted less than 3 days. In that study, women who bled miscarried no more often than women who didn't (12% vs 13%). Still, call your provider if bleeding is heavy like a period, or comes with strong cramps, pain on one side, shoulder-tip pain, or feeling faint.
Is it normal to have no symptoms at 6 weeks pregnant?: Yes. Many people feel little or nothing at 6 weeks. Nausea most often starts around week 6, but for some it begins later, and some people never get it. Having no symptoms is not, on its own, a sign that something is wrong. The only way to check how a pregnancy is growing is a scan or blood tests, not how you feel.
Why do I have cramps at 6 weeks pregnant?: Mild, period-like cramps are common as the uterus starts to grow. They usually come and go and ease when you rest. Call your provider promptly if cramps are severe, stay on one side, or come with bleeding, fever, shoulder-tip pain or dizziness. These need checking to rule out an ectopic pregnancy or a miscarriage.
What is the chance of miscarriage at 6 weeks pregnant?: About 10 in 100 known pregnancies end in miscarriage, mostly in the first 13 weeks. Seeing a heartbeat lowers the odds a lot. In a study of nearly 700 women with no symptoms whose scan showed a heartbeat, 9.4% of those scanned at 6 weeks later miscarried, compared with 4.2% at 7 weeks and 1.5% at 8 weeks. About half of early losses happen because the embryo has an abnormal number of chromosomes. Working, exercise, stress and sex do not cause miscarriage.
Are there signs of a boy or girl at 6 weeks pregnant?: No. Symptoms, cravings and how sick you feel do not predict the baby's sex. Heart rate doesn't either: a study of 477 pregnancies found almost the same first-trimester heart rate for girls (about 152 beats per minute) and boys (about 155). A blood test called cell-free DNA screening can report sex chromosomes from 10 weeks, and the anatomy scan can usually show sex at around 18 to 22 weeks.

Useful at week 6

hCG levels by week — typical ranges at 6 weeks, and why the trend matters more than one number
When does morning sickness start? — what to expect from nausea over the next few weeks
Is Zofran safe in pregnancy? — if nausea gets hard to manage
Coffee in pregnancy — how much caffeine is considered OK
Foods and activities to avoid — the quick list for the first trimester

← All weeks: the full pregnancy week-by-week guide

Sources

Checked against the following public guidance on October 2, 2026. Advice can differ between countries; your doctor, nurse or midwife can apply it to you.