Sex F****** Hurts!

With my sons pregnancy I was the damn energizer bunny of sex! It was amazing, felt amazing, so many orgasms, I felt so close to my SO. I'm 19 weeks with #2 and so unbelievably turned off. My SO and I are very physical and its really start in to effect our relationship. I try but everytime it hurts so bad!😥 We use lube and lots of foreplay and that's great but as soon as he trys to enter, its game over. And if we manage to have intercourse, I cant orgasm and it hurts like hell the next day. Why?? Just Why?!?!