Understanding Pregnancy Timeline & Trimesters
Track important gestational milestones, fetal development phases, and expected delivery windows.
Trimester Breakdown
- First Trimester (Weeks 1–12): Key organ formation, initial ultrasound scans, and early pregnancy symptoms.
- Second Trimester (Weeks 13–27): Rapid growth, movement detection, and mid-pregnancy anatomy scans.
- Third Trimester (Weeks 28–40+): Final development, position shifting, and preparing for childbirth.
Frequently Asked Questions
How is the estimated due date calculated?
Due dates are typically calculated using Naegele’s Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP).
When does ovulation occur in a menstrual cycle?
Ovulation usually happens about 14 days before your next period begins (around day 14 in a standard 28-day cycle).
How long does a normal pregnancy last?
A full-term pregnancy ranges from 37 to 42 weeks, with 40 weeks being the standard estimate.