preggo sex hurt😭

Im not sexually active other than the only time i had sex and made my baby  🙊 before that and after that i wasnt having sex and now that im 5 months pregnanti had sex for the first time and it hurt so much! I wasnt getting wet and when he put his penis inside it hurt so bad i thought i was a virgin again😩  i wasnt confortable in any position we tried and then the following day we had sex like nothing , it only hurt at the begginign when he put it in but after that it didnt hurt at all. has this happened to anyone else? Would that be because i dont have sex or because my vagina is changing during pregnancy?