You’re least likely to get pregnant during your period and a few days before your period, says Christine Greves, MD, FACOG, an ob-gyn at the Winnie Palmer Hospital for Women & Babies in Orlando. While your ovulation timeline can fluctuate, menstruation follows a more predictable pattern. Healthy women get their periods 12 to 14 days after ovulation if the egg isn’t fertilized, Knopman says. On average, bleeding can last for two to seven days. (Keep in mind that these are just estimates based on averages; every person’s cycle will vary based on their individual circumstances.)