I've recently just started sleeping with my boyfriend and the first time we had sex there was no problem but after the second time i noticed this big lump just in the inside area. It went away within a few hours and we had sex for the third time and now it has come back and has been there for 2days now. Im going to the doctor first thing Monday morning but im still really scared for my body and id like to know if you have any ideas on what this could be? And how do i approach my partner about this?