🤰 First trimester
7 weeks pregnant
Your baby is about the size of a blueberry
By Emma Whitfield · Pregnancy & Baby Writer
Your baby at 7 weeks
The brain is growing rapidly and the arm and leg buds are lengthening. Early kidneys and the digestive tract are forming. Facial features are becoming more defined.
Your body at 7 weeks
Fatigue can feel overwhelming this trimester — your body is building a placenta. Some people have more saliva, food aversions or a metallic taste.
Common symptoms this week
- Peak-building nausea
- Overwhelming tiredness
- Excess saliva or a metallic taste
- Food cravings or aversions
Symptom lists are typical, never exhaustive — and having none of them is normal too.
Focus this week
Rest when you can and don't fight the tiredness. If sickness stops you keeping any fluids down, contact your midwife or GP — severe sickness has treatment.
Week 7 checklist
- Rest without guilt — building a placenta is hard work
- Contact your midwife or GP if you can't keep fluids down
- Start a symptom note for your booking appointment
7 weeks pregnant: common questions
When does morning sickness peak?
For most people nausea peaks between weeks 8 and 10, then eases substantially between weeks 12 and 16. If you can't keep fluids down, are losing weight or feel faint, contact your GP the same day — severe sickness (hyperemesis gravidarum) is a recognised condition with real treatment.
How big is my baby at 7 weeks pregnant?
At 7 weeks, your baby is approximately the size of a blueberry, about 1cm. These are approximate averages — every baby grows at its own pace.
What's happening at 7 weeks pregnant?
The brain is growing rapidly and the arm and leg buds are lengthening. Early kidneys and the digestive tract are forming. Facial features are becoming more defined. For you: fatigue can feel overwhelming this trimester — your body is building a placenta. some people have more saliva, food aversions or a metallic taste.
Which trimester is 7 weeks?
7 weeks pregnant is in the first 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.