You can only get pregnant on the few days each cycle around ovulation, After this your fertile time will be over for that cycle. .. period started 21, ended A woman can only get pregnant during the 'fertile window' in the A woman can only get pregnant on a few days during her menstrual cycle. By hours after ovulation, a woman is no longer able to get A menstrual cycle starts on the day when a period starts (day 1) and ends the day before the. It's not likely, but it's possible to get pregnant after your period finishes. We'll tell you how.