My boyfriend and I were having sex and the condom slipped off inside me. I have been on birth control for over a year, but recently switch to a new brand, almost the same, exactly one week ago. Should I go in and get the Plan B pill? The condom we used had spermacide in it and he didn't ejeculate inside me cause we used the same one twice. I know it was on when he went. Then it slipped off and we caught it a few minutes later. What should I do? What are my risks of pregnancy?