I had my period since my last time having sex. i don't think i'm pregnant, but is there a possibility of me having my period and still being pregnant?

Maybe: Its physiologically not possible to be pregnant if you truly had a period since having intercourse. The catch, of course, is that its sometimes hard to know if your bleeding was a period or bleeding from some other cause . You can be pretty certain, if the bleeding came a the right time and was normal in terms of duration and flow. Best wishes!