I had my period 2 weeks ago and I skipped birth control for a month well now I just got back on my birth control and now my lower back is hurting, headaches, bloated, cramps, and I'm bleeding dark brown light reddish discharge, and I'm getting naseated in the car, is this my birth control causing all this? Or could I be pregnant?

I think you should try asking your OB-GYN...