1st TrimesterMonth 3Week 12 of 40
12 Weeks Pregnant
— How Many Months Is It?
12w
Equivalent to
Month 3
1st Trimester
🍑
Baby is the size of a
Plum
5.4 cm (~2.1 in) · 14g
🌱Fetal Development Milestones — Week 12
Reflexes develop and the kidneys start producing amniotic fluid. This marks the milestone end of the 1st trimester!
Pregnancy timeline progress30%
Week 1Week 12Week 40
Calculate Your Exact Due Date
Enter your last period date for an instant gestational calculation
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Enter your date to calculate gestational age.
⚠️ Based on ACOG guidelines and Naegele's Rule for informational purposes only. Consult your OB-GYN.
Frequently Asked Questions — Week 12
12 weeks pregnant equals Month 3 of gestation in the 1st Trimester. Because calendar months vary between 28 and 31 days while weeks are exactly 7 days, clinical tracking in weeks provides the most accurate timeline.
Reflexes develop and the kidneys start producing amniotic fluid. This marks the milestone end of the 1st trimester!
Use the calculator above: enter the first day of your last period (LMP) and the tool will calculate your exact estimated due date using Naegele\'s Rule (LMP + 280 days).