I took my first BC pill, missed the second, took the third, missed the fourth, took the fifth and sixth, and then stopped taking them. I had unprotected sex four times during that time. My period would normally be due May 18, but today I had bright red (usually I have dark red) blood that came on quickly rather than gradually. It started pink (normally starts brown). Could this be a problem with hormones, or a sign of pregnancy? Please help!