Pain the second day

Hi! 
So I had sex with this guy last night it was the first time with him and my god this man was huge!!! I couldn't fit my fingers around him.
He got off 4 times and he was quite rough each time. He's the biggest I've ever been with and when I went to clean up, I saw a bit of red along with the other stuff lol. 
Today I'm incredibly sore, it hurts to sit and even laying down there's a very strong throbbing pain. I've never experienced anything like this after sex.
What should I do? Is this normal after being stretched or should I see a doctor?