text: can women get pregnant by having sex while not in a period?   every period is different but using the textbook number of 28 means your ovulation should occur around the 14th day after your period begins. again, this date varies depending on the length of your cycle. male sperm can live up to 5 days so making love between the 8th day and the 20th day holds the most risk. overall, there is a 30% chance of pregnancy every time.