🤰 Second trimester
15 weeks pregnant
Your baby is about the size of an orange
By Emma Whitfield · Pregnancy & Baby Writer
Your baby at 15 weeks
The baby is moving a lot now — stretching, wriggling and even hiccupping — though most first-time parents still can't feel it. They can sense light through closed eyelids.
Your body at 15 weeks
Some people get a stuffy nose or nosebleeds in pregnancy (extra blood flow to mucous membranes). Skin changes like a darkening line down the belly can appear.
Common symptoms this week
- Stuffy nose or nosebleeds
- Darkening line down the belly (linea nigra)
- Occasional headaches
Symptom lists are typical, never exhaustive — and having none of them is normal too.
Focus this week
If you're having the quadruple blood test for Down's syndrome screening, it's usually offered between 14 and 20 weeks.
Week 15 checklist
- Ask about the quadruple blood test (14–20 weeks) if you missed combined screening
- Drink consistently through the day — headaches in pregnancy are often hydration
15 weeks pregnant: common questions
Why do I have a stuffy nose in pregnancy?
Pregnancy rhinitis — extra blood flow swells the mucous membranes, causing congestion and easier nosebleeds with no cold behind it. Saline sprays and humid air help; check with a pharmacist before using decongestants, as many aren't recommended in pregnancy.
How big is my baby at 15 weeks pregnant?
At 15 weeks, your baby is approximately the size of an orange, about 10.1cm and around 70g. These are approximate averages — every baby grows at its own pace.
What's happening at 15 weeks pregnant?
The baby is moving a lot now — stretching, wriggling and even hiccupping — though most first-time parents still can't feel it. They can sense light through closed eyelids. For you: some people get a stuffy nose or nosebleeds in pregnancy (extra blood flow to mucous membranes). skin changes like a darkening line down the belly can appear.
Which trimester is 15 weeks?
15 weeks pregnant is in the second trimester. The first trimester runs to the end of week 12, the second from weeks 13 to 26, and the third from week 27 to birth.
Sources & further reading
This is general information, not medical advice — every pregnancy is different. For anything that worries you, and for all your antenatal care, speak to your midwife or GP. If your baby's movements ever slow down or change, contact your maternity unit immediately, day or night. Reviewed July 2026.