Yes, pregnancy is only possible during a short window around ovulation, but that window is a bit wider than many people think. Conception happens when a sperm meets an egg, and the egg is released only once per cycle during ovulation.
Sperm can survive inside the body for up to five days, while the egg lives for about 12 to 24 hours after ovulation. Because of this, pregnancy can occur from intercourse that happens in the five days before ovulation and on the day ovulation occurs. This group of days is often called the fertile window.
Ovulation does not always happen on the same day each cycle. Even people with regular periods can ovulate earlier or later than expected, which is why pregnancies sometimes seem to happen when someone thought they were not ovulating. Ovulation calendar tracking alone can be unreliable, since cycle length does not always match the actual day the egg is released.
For those trying to conceive or avoid pregnancy, understanding this fertile window is important. If there are concerns about cycle timing, fertility, or birth control options, it is best to speak with a gynecologist for personalized guidance rather than relying on apps or self-estimates.