I had sex for the first time since December last night. It was with a guy I used to hook up with last semester and I never bleed before from sex with him, but last night he handled me more rough than I've been handled in a long... even before him originally. It was a really tight fit and normally when I have sex the guy has to insert slowly but he just jammed it in and basically went to pound town. We used three different positions and we experimental in each position. I woke up the next morning and I was covered in blood... luckily I didn't bleed through his sweat pants I was wearing but I have been bleeding all day and every time I pee it worsen for a short amount of time. It has only been a week since my last period and my periods are typically 4 to 5 weeks apart. What could've happened?

Tearing, of tissure, damage, and irritation, no it does not cause a period, but it can cause damage

Definitely some irritation. I've had this happen to me as well lol. What I did to fix it was treated it like a period and just put a tampon in. It helped stopped the bleeding and after 3 hours it cleared up. Make sure to stay clean (even though I'm sure you do already xD), in case of infections though (don't want that lol).