What’s happening to me

I got my period at the beginning of this month. Lasted its normal 5 days. Two weeks later... im bleeding again and this has been going on for 10 days straight now. What’s happening? In those two weeks of me not bleeding i have been having unprotected sex. Dont tell me take a test because I’ve took MANY, they are all negative. But if its implantation then they are gonna be negative while im bleeding. My doctor also said so. Im not cramping im not having anything going on except im constantly bleeding. It doesn’t even pause for a few minutes like my period does. Its just pouring out of me.