READ! PLEASE! TMI THOUGH!

So me && my Fiancé was going at it doggy style && he hit something while in me that never happened before? We wasn't going rough like we usually do either? Because we trying to have a baby so we been going easy just IN CASE I'm 5 dpo could I be pregnant while in that position he came really deep like he was in my gut? So was it just closed or something IDK? Because it put me in so much pain I was crying!? He felt really bad && held me. That has never happened?