he pulled out?? that method is proved to be useless. cause there is pre the comes out during sex.
It is possible to get pregnant on your period, but you could've been just ending it. My periods last 5 days. Keep track this month of when you started and stopped and see if you have somewhere around that time (a certain day of the week of the month).
If your late next month by a couple days and it worries you, take a test. even if your worried now try a test out.