Am I pregnant? What are my chances?

Patient : My boyfriend and I had sex this last sunday afternoon (Dec. 4th, 2011) and the condom broke right as he was ejaculating leading to a decent amount in my vagina. I was supposed to receive my period today (Dec 7th, 2011). I have not received it yet and my last period started Nov. 9, 2011 and lasted about 6 days. My periods are typically very regular on a 28 day cycle. I also take birth control but the past couple week I have been forgetting and doubling up every other daybecause of finals for school. I know that reduces effectiveness but we also went and got Next choice plan b pill and I took the first dose within an hour after sex and I took the next pill exactly 12 hours after the first. I am stressing about this and need some reassurance. I have read that plan b causes some people to not receive their period as well. What are my chances of being pregnant? And when should i take a pregnancy test if I dont receive my period this month? If I receive this month's period am I in the clear (since the sex was just a few days before I was supposed to get it) or will I not be in the clear until next month's period? PLEASE HELP!
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