I had sex the day after I got off my period and I been using birth control and took plan B after 6 days we had sex. My boyfriend doesn't know if he came inside me, I doubt he did. But how safe am I? I been feelings weird lately but I don't know if it's the side effects of the plan B or that I could be pregnant. By weird I been feelings full even when I don't eat and I been having a lot of gasses.