Bleeding after masurbating HELP PLEASE

I’m 16 and yesterday I masturbated and a few hours later I started bleeding from my vagina. It stopped but then today I’m bleeding again and now I have abdominal cramps, similar to period cramps. I’m very scared this has never happened to me when I masturbated before. I’m also 100% sure this can’t be my period because I always get my period on time and I shouldn’t get it for another 11 days. Please help me I’m so scared and embarrassed