Had sex with boyfriend on 3/15 and also on 3/22 and we used a condom both times. When we had sex on 3/22, told him to be careful since I was put on antibiotics. Currently on my placebo week since I am also on birth control pills. I was supposed to get my period this week but instead of getting a normal flow period like I always do, I’m just having dark brown blood that is very light/spotting. Should I take a test? And when can I take a test to be accurate if I could be pregnant?