13 Weeks Pregnant: What to Expect

Thirteen weeks marks the finish line of the first trimester and the start of what many people find the most comfortable stretch of pregnancy. Your baby is now roughly the size of a lemon, and your body is quietly moving from "building the foundations" mode into steady, visible growth. For many women, this week brings a genuine sense of relief.

Your baby at 13 weeks

Development is moving quickly now that the major organs are formed:

Fingerprints are forming on tiny fingertips.
Vocal cords are developing, though obviously there's no sound yet.
The intestines, which have been developing inside the umbilical cord, are moving into the abdomen where they belong.
Bones are starting to harden, particularly in the arms and legs.
Your baby can make small movements — you won't feel these yet, but they're happening.

The placenta has now largely taken over hormone production from the corpus luteum, which is one of the reasons many pregnancy symptoms start to settle down around this point.

What you might be feeling

Thirteen weeks is often described as the turning point of early pregnancy:

Nausea and morning sickness typically start easing for most women, though some continue into the second trimester.
Energy levels begin to lift as extreme first-trimester fatigue fades.
You may notice your waistband feeling snugger — a small bump can start to show, especially if this isn't your first pregnancy.
Breast tenderness often eases slightly compared with earlier weeks.
Some women notice a return of appetite and interest in food after weeks of aversions.

Not everyone feels dramatically different overnight — for some, the shift is gradual over the next week or two rather than an instant switch.

Looking ahead to the second trimester

This is a natural moment to start turning your attention forward:

Book your antenatal (NCT or NHS) classes if you haven't already — popular slots fill up.
Start thinking about when and how you want to tell wider family, friends, or work, if you haven't already announced.
Your 20-week anomaly scan will be booked around now or soon after — keep an eye out for the appointment letter.
It's a good time to review your diet and make sure you're still taking your daily supplements.

Your risk of miscarriage drops considerably once you're safely into the second trimester, which is part of why many women feel able to relax a little at this stage.

Frequently Asked Questions

What should I focus on at 13 weeks?

This is a good week to celebrate reaching the end of the first trimester, book any antenatal classes you want to attend, and start planning for the practical side of the second trimester, such as maternity clothes or telling your workplace. Many women also find their energy returning enough to catch up on things they've put off.

Will my morning sickness definitely stop now?

For many women, nausea eases significantly around 13-14 weeks as hormone levels stabilise, but this varies a lot between pregnancies. Some continue to feel queasy into the second trimester or beyond, and that's still within the range of normal. If sickness is severe and you can't keep fluids down, contact your midwife or GP as this could be hyperemesis gravidarum.

Is it normal to not have a bump yet at 13 weeks?

Yes, completely normal. Bump timing varies hugely depending on your body shape, whether it's your first pregnancy, and your baby's position — many first-time mums don't show a proper bump until closer to 16-20 weeks. If you're worried about your baby's growth for any reason, your midwife can check in at your next appointment.

This article is for informational purposes only and does not constitute medical advice — always speak to your midwife or GP about your individual pregnancy.

Related articles: