What Does Heavy, Short Periods Followed By Pink Spotting After Missed Pill Mean?

I am on birth control. Last month I missed a total of 4 pills and had unprotected sex with ejaculation inside while having intercourse. the last week of pills I stopped taking the last 3 pills (fri, sat, sun) and had unprotected sex thu-sun with multiple ejaculations inside. Usually i get a heavy flow of 5 days straight 2 days after i stop taking the pills (which would have been sunday) on tuesday i got a heavy day and wednesday then stopped completely thursday am (2 days of flow, which never in my life has happened) then faint pink (barely nothing) for a day. what are the chances i am pregnant?