Slight Bleeding...why??

Im a teenager and ive been having sex with my boyfriend for a few months now. While he was fingering me one day, I he pulled out his fingers and there was blood on them. We figured I had my period but the next day, I didnt have it. After a couple of days without it, he fingered me again and it happened once more but a bit heavier. I ended up getting my period a few days later so we were relieved that I wasnt pregnant or anything. My period ended a few days ago. My boyfriend fingered me and there was no blood at the time but later when I went to the bathroom, some blood came out. Instead of usual normal discharge, its got a little blood in it. It's light and pinkish/bloody color. After I go to the bathroom, the toilet paper would have light blood on it. I dont get it. I let my mom know but I was hoping someone could calm me down because at the moment im thinking it could be a lot of things [diseases or whatnot]. Does anyone have any idea what it is? Could it be from getting fingered too hard? Can a guy finger you too deep or hurt something up there?
Please help because I really cant stand stressing over this :( :cry: