off birth control, try to convince

Hey all, I recently got off birth control on sept 25,trying to convince 
I had my period that started sept 28thay lasted around 5days. I have had sex everyday since other then oct 11! 
I've been having some minimal cramping in my lower abdomen, that comes and goes. Today they were abit more often, I took a test and it was negative. Can I maybe be pregnant or getting my period?
Please help