Week 4 of pregnancy — 1st trimester. Baby is the size of a poppy seed 🌸, approximately 0.1cm long. Embryo implants in uterine wall. hCG detectable — positive test possible. 10% of the 40-week journey complete, 36 weeks remaining.
PREGNANCY WEEK 4 — 1st TRIMESTER
🌸
poppy seed
baby is about the size of a poppy seed
WEEK
4
of 40
LENGTH
0.1cm
crown to rump
WEIGHT
tiny
approximate
36 weeks remaining · Embryo implants in uterine wall. hCG detectable — positive test possible.
WEEK 4 — BABY'S DEVELOPMENT
1ST TRIMESTER · Weeks 1–12
Embryo implants in uterine wall. hCG detectable — positive test possible.
HOW YOU MAY FEEL
Morning sickness may begin. Fatigue common. Breast tenderness.
WEEK 4 KEY FACTS
Gestational age
Week 4
Trimester
1st (T1)
Baby length
0.1cm
Baby weight
tiny
Progress
10% complete
Weeks left
36 weeks
What happens at week 4 of pregnancy?
At week 4 of pregnancy (1st trimester):\n\nBaby development: Embryo implants in uterine wall. hCG detectable — positive test possible.\n\nBaby size: poppy seed 🌸\nLength: approximately 0.1cm (crown to rump)\nWeight: approximately too small to measure\n\nPregnancy progress: 10% complete (36 weeks remaining)\n\nGestational age is counted from the first day of your last menstrual period (LMP), not from conception. Week 4 begins on day 22 and ends on day 28 from your LMP.
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Pregnancy week 4 · 1st trimester · Baby size: poppy seed 🌸 · 0.1cm · tiny · Sources: ACOG, WHO fetal growth data