First Trimester
3 Weeks Pregnant
Your baby is the size of a Grain of rice 🌾
🌾
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026
📏
Size
Grain of rice
📐
Length
0.1 cm cm
⚖️
Weight
NaN g
🗓️
Trimester
First
⏱️
Week
3 of 40
🌱 Baby Development at Week 3
Fertilization! The sperm meets the egg and forms a zygote. The zygote divides rapidly and travels to the uterus, becoming a blastocyst by end of week.
Fertilization occursZygote forms and divides
🤱 Common Symptoms
●Usually none detectable
●Possible implantation spotting
●Slight cramping
🥗 Nutrition Tips
- Continue folic acid 400mcg+
- Avoid alcohol completely
- Eat whole grains and legumes
🏃♀️ Exercise Tips
- Continue normal routine
- Avoid overheating
- Stay hydrated during workouts
🏥 Medical Tests & Appointments
Too early for home pregnancy test
🔬 Hormone Changes
Early hCG production begins after implantation. Progesterone rises to maintain the uterine lining.
Frequently Asked Questions
Common questions answered by our medical team