Hi, So I Am Really Concerned. My Boyfriend And I

Hi, so I am really concerned. My boyfriend and I have been fooling around recently. He fingers me pretty roughly. He did a day ago, and the next day when I went to the bathroom, I had a red/dark brown bloody discharge. We had sex once though, he put it in only once and then took it out. I don't know if I can be pregnant or he just scratched me when he fingered me.