I have been on birth control for 2 months somewhere in between there I didnt take it for 2 weeks. During those weeks I had protected sex. After I had sex I went back on birth control. I missed my period this month, I am 11 days late. I have been experiencing brown discharge for the past few days. It has been 28 days since the last time I had sex. Could I be pregnant or is this just my birth control?