I thought bigger was better..

So my boyfriend has a pretty big penis and the last time we had sex everytime he would go deep I this pain shooting through my hip so bad I cried. I tried to just suck it up and take the pain but I finally had to tell him to stop and then told him not to go as deep. He was pretty disappointed but I don't know what happened or what's wrong or if it was just a cramp, I worked over 60 hours on a job the is all on my feet all day does that have something to do with it?