Specific Pregnancy & Fertility Calculators
Jump directly to specialized obstetrics, trimester, and fertility milestone tools:
Estimate your expected delivery date using Naegele's 280-day rule from LMP.
Identify the 6-day fertile window and peak ovulation dates for family planning.
Calculate the estimated date of fertilization based on due date or cycle length.
Track your current completed gestational weeks, days, and developmental milestones.
Target gestational weight gain ranges personalized by pre-pregnancy BMI.
Calculate exact calendar start and end dates for 1st, 2nd, and 3rd trimesters.
Estimated embryo implantation dates and optimal days to take a home pregnancy test.
Calculate delivery dates for 3-day and 5-day blastocyst embryo transfer cycles.
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.