Help me

Hello! I had sex this cycle with my boyfriend during what would be my "ovulation week" but I'm on birth control and take it perfectly, anyway- he came in me as the condom broke and my withdrawal bleed came on the 14th and it was quite heavy and lasted 3-5 days as usual and stopped like today. However, my lower abdomen bloat is really causing me some concern, is that seriously just from the pill? I mean surely I can't be pregnant as I got my withdrawal bleed but I'm still really worried? Is it just the pill? I can tell I've put on a little bit of weight but I'm worried, help