During which phase of the menstrual cycle is it impossible for a woman to become pregnant?

Question

Quizplus · Accepted Answer

It is theoretically possible for a woman to become pregnant during any phase of the menstrual cycle, though the likelihood varies. Sperm can live inside the female reproductive tract for up to five days, and ovulation can occur earlier or later than the typical day 14, making it difficult to pinpoint a phase during which pregnancy is impossible.

During Which Phase of the Menstrual Cycle Is It Impossible