First Trimester
Week 12: Risk of miscarriage drops significantly after 12 weeks.
Here's everything happening with your baby and your body this week.
Your baby is the size of a
Lime
Length
2.1 in
Weight
14 g
Week
12 / 40
💡 Expert tip
The 12-week ultrasound (dating scan) gives a more accurate due date and checks for structural development. Schedule it if you haven
🌱 Baby's development this week
- Reflexes developing — fingers open and close
- Kidneys produce urine into amniotic fluid
- Brain growing rapidly — cerebral cortex forming
- Baby can yawn, hiccup, and suck thumb
Science fact
After 12 weeks, the risk of miscarriage drops to under 1% for otherwise healthy pregnancies. The placenta is now fully formed and has taken over all hormone production.
🤰 Your symptoms this week
Linea nigra begins appearing
dark line from navel to pubic bone, harmless
Uterus now feels above pubic bone if pressed gently
Most women feel noticeably more energetic this week
💛 Changes in your body
- End of the first trimester — energy often returns
- Uterus now large enough to feel above pubic bone
- Skin changes: linea nigra (dark line) may appear
- Many women share pregnancy news around now
💙 Mental health this week
Many couples experience relationship strain in the first trimester — fatigue, nausea, and anxiety affect intimacy. Communication about needs is more important than solutions.
🥗 Nutrition focus
- Probiotics support gut microbiome — babies colonized during birth from mom
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📅 Appointment / test
12-week dating scan (or combined screening scan): confirms due date, checks for twins, nuchal translucency measurement.
✅ This week's checklist
Schedule 12-week scan if not already done
Begin telling your employer — maternity leave planning requires advance notice
Start documenting your bump with weekly photos
Track your pregnancy week by week
Interactive guide · 40 weeks · Fruit size visualizations · Personalized tips
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