Pain after sex 😩

So me and my husband have sex regularly. But sometimes it can be painful. I will say, he is WELL endowed . So of course I go googling why it could be painful during intercourse and it pops up all these stories of endometriosis and bad things! I'm alreAdy concerned with my fertility (just because I'm a worry wart) and so this others me. It doesn't hurt all the time. Like today, we had sex twice this morning and it was fine, had sex tonight and it was a little painful, like he goes REALLY REALLY deep. I just need to know I'm not the only one who expirences this and that my lady parts are not messed up! :( also, I've had a pap and nothing came back in any form for endometriosis or anything like that. I just need some reassurance.