can you get seriously injured from sex?

Brenna
So I guess my boyfriend was going to hard or I was in a weird position but I'm in pain. 
We haven't done anything we don't normally do but this time when we were done I was in so much pain I almost threw up. I could barely sit up or walk. It's been a day and I'm still in pain. I was going to give it a few more days but I'm worried about it. Do you think it could be something more serious? It's pain in my lower abdominal area. I hurts to touch it and sometimes it hurts when I try to pee.....😳