Brown spotting and cramps?

So I had sex about two weeks ago and yesterday I noticed a lot of brown spotting. I think it may be because we were doing other things and he was being a little rough. But I'm just worried that it could be something because it's never been THAT much brown spotting. And now I'm cramping. I'm only one day late (so far) which is fairly normal for me. Can someone please calm my nerves?