pain?!

So two days ago I had sex with this guy who I've slept with a few times and he's fairly big but it's never really been a problem. This last time it was just way too much to handle (I was coming down with the flu and I have been sick since so maybe that's why??) and we stopped pretty quickly. However, later that night I started getting a lot of pain in my vagina when I move, sit, pee, anything that puts any kind of pressure on that part of my body. It's continued the last two days and I can't figure out what it is!!!! Anyone have any ideas/advice??