🤰 Pregnancy Conception Calculator
Estimate your conception date and window of fertility based on your due date or last menstrual period.
Understanding Conception
Conception occurs when a sperm fertilizes an egg, typically within 24 hours after ovulation. However, because sperm can survive in the female reproductive tract for 3-5 days, the fertile window is actually several days long.
The Fertile Window
- 5-4 days before ovulation: Sperm can survive and wait for the egg
- 3-1 days before ovulation: Increasing fertility
- Day of ovulation: Peak fertility
- 1 day after ovulation: Egg viable for 12-24 hours
Timeline of Early Pregnancy
| Day | Event |
|---|---|
| 0 | Conception (fertilization) |
| 3-4 | Embryo reaches uterus |
| 6-12 | Implantation occurs |
| 14 | hCG hormone detectable in blood |
| 21 | Home pregnancy test positive |
| 266 | Due date (38 weeks from conception) |
Note: This calculator provides an estimate. The exact conception date can vary based on individual cycle length and ovulation timing.