I felt pain while I was pleasuring myself, there was blood on my fingers

I've been masterbating for a long time now but I only rub my clit. Yesterday I decided to go a little bit further by fingering myself. I've never done this before and I was kinda scared. I felt pain but after a couple seconds it started to feel good. But once I took my fingers out I noticed they had blood (not a lot) I kinda freaked out and I still am. I'm not on my period and i shouldn't be on it till the 20 of this month. Can anyone help me? I'm extremely scared I did something stupid. {btw I am a virgin and 15}