have been on birth control for about half a year and I have taken basically perfectly, and this month I took every pill on the dot. Well eleven days ago I had sex without a condom and a few days later I felt a little sick, but a bug was going around. I took a pregnancy test yesterday (10 days after sex) and it was negative. I know that was early now and could be a false negative. I usually get my period on the 3rd placebo pill and today I just took the last active pill this morning and tonight I started spotting brown here and there. I am wondering if I am pregnant or if this is the start of my period, just earlier than usual by 3 days (it does usually start out brown). Am I pregnant? Also, when can I take another pregnancy test?