My girfriend and I had sex on a Saturday. She was supposed to start her period that next Monday. The condom slipped off and got stuck all the way up inside her (she had to literally reach in and dig it out.) We freaked, and decided we'd get a hold of Plan B for her to take. She started her period kind of light the next day (Sunday.) We got her the Plan B and she took it on Monday (40 hours after the accident.) Her period got pretty heavy just before that though. We're just worried and wondering what the chances are that she might be pregnant. She started her period the very next day after sex, and she also took the Plan B within the time limit, but we're still somewhat nervous..... Any thoughts?