PLEASE HELP

Byrd

So I started my birth control on the Sunday I got my period which was the 13th of May, I had sex on the 24th, I’m having some cramps and bleeding and I’m not sure if it’s my body adjusting to the birth control or if I might be pregnant. Was I protected by the birth control since I had been taking it for 12 days but I had sex or could I be pregnant?