Well, any time you have unprotected sex, you -could- get pregnant. That's a more unlikely time, though. Three days before your period usually means you already ovulated and you can't usually get pregnant once you've ovulated (unless you have a rare second egg). To get pregnant, try this . . . start tracking your cycle. Cycle day one is the first day of your period. Then count from there. On day 10, begin having sex every other day (for good sperm count) for the next 10 days. This usually catches the egg. good luck