Best Days to Get Pregnant With a 27-Day Cycle
If your cycle is 27 days long, your chance of pregnancy is highest on cycle days 11 to 13: the two days before ovulation and ovulation day.
| Cycle length | 27 days |
|---|---|
| Likely ovulation day | Cycle day 13 (range 11–15) |
| Fertile window | Cycle days 8–13 |
| Most fertile days | Cycle days 11–13 |
| Next period due | Cycle day 28 |
Why the days before ovulation matter most
Studies of couples trying to conceive found that sex in the one to two days before ovulation is linked with the highest pregnancy rates. Sperm need some time to travel and become ready to fertilise an egg, so having them in place before the egg is released helps.
How often to have sex
Every day or every other day during the fertile window works well. There's no need to save up sperm, and frequent sex in this window doesn't lower the chances.
A 27-day cycle sits within the typical adult range of 21 to 35 days.
Ovulation Calculator for a 27-Day Cycle: Ovulation and fertile days for a 27-day menstrual cycle.
Open the calculatorThis article is general information, not medical advice. Talk to a doctor or midwife about your own pregnancy or fertility.