TMI Painful..

Well for the past few days every time me and my boyfriend it has been really painful for me. As in like at first it hurts like crazy then after a few times it doesn't hurt as bad and then at the end it starts hurt again. We've been having unprotected sex for the last couple of monthes but I took birth control. It's never been like this until recently. I'm just want to know of what could make it painful..