So me and my bf had sex on March 20th and the condom broke that day the next day at 11pm I took plan b I got my period a day late on the 26 and I started taking birth control and after my period ended for about 4 or 5 days I had brown discharge and every night after I take birth control at 8:30 I usually wake up at about 1 or 12 feeling very sick and I did throw up once but I've felt very sick and constipated and my stomach has been hurting but then it stops usually in the morning sometimes it dosnt. What's going on am I pregnant or is it my birth control