Blog

From ovulation to implantation: what actually happens when a pregnancy begins.

Why due dates are counted from your last period, and how cycle length and ultrasound change the result.

Cervical mucus, LH tests, temperature and other signs that ovulation is near or has happened.

Why there are only about six days each cycle when pregnancy is possible, and how to find yours.

Sperm can survive up to five days; an egg about a day. Here's what that means for timing.

Implantation usually happens 6 to 12 days after ovulation. Learn about timing, bleeding and testing.

The earliest and most reliable times to test, and what to do with a negative result.

Why irregular cycles make timing harder, and practical ways to find your fertile days.

How LH tests work, when to start testing and how to read the results.

How to chart your temperature to confirm ovulation, and what the pattern means.

What your cervical mucus says about your fertility at each stage of the cycle.

Why your due date might change after a scan, and which date to trust.

Only a small share of babies are born on their due date. Here's why, and what the normal range is.

How due dates are calculated after fresh and frozen embryo transfers.

How to track your cycle, what to record and how to use it to find your fertile days.

Guidance on how long to try before getting a fertility evaluation, and reasons to go sooner.

Common beliefs about timing sex, positions and choosing a baby's sex, compared with the evidence.

With a due date of January 1, conception most likely happened around April 10. See the conception window, fertile days and key pregnancy dates.

With a due date of January 2, conception most likely happened around April 11. See the conception window, fertile days and key pregnancy dates.

With a due date of January 3, conception most likely happened around April 12. See the conception window, fertile days and key pregnancy dates.

With a due date of January 4, conception most likely happened around April 13. See the conception window, fertile days and key pregnancy dates.

With a due date of January 5, conception most likely happened around April 14. See the conception window, fertile days and key pregnancy dates.

With a due date of January 6, conception most likely happened around April 15. See the conception window, fertile days and key pregnancy dates.

With a due date of January 7, conception most likely happened around April 16. See the conception window, fertile days and key pregnancy dates.

With a due date of January 8, conception most likely happened around April 17. See the conception window, fertile days and key pregnancy dates.

With a due date of January 9, conception most likely happened around April 18. See the conception window, fertile days and key pregnancy dates.

With a due date of January 10, conception most likely happened around April 19. See the conception window, fertile days and key pregnancy dates.

With a due date of January 11, conception most likely happened around April 20. See the conception window, fertile days and key pregnancy dates.

With a due date of January 12, conception most likely happened around April 21. See the conception window, fertile days and key pregnancy dates.

With a due date of January 13, conception most likely happened around April 22. See the conception window, fertile days and key pregnancy dates.