I got off my period 1/15/13 had sex 1/16/13 &1/17/13 now I started back, bleeding what is going on can u help?

Irregular bleeding i. Is not uncommon! it is not likely from pregnancy if you finished a period on the 15th and started bleeding again on the 18 th. Check a upt but low probability. You may need to get on the pill to regulate bleeding but you may wanna get seen, your not dying though.