Plan B... side effects or pregnant?

I had sex with my boyfriend on Feb. 4, and afterwards we found out that the condom broke. We immediately went to the pharmacy and bought Plan B--I took the first pill within an hour to an hour and a half of having sex. I took the next pill exactly 12 hours later, just like it said. My period was due... show more I had sex with my boyfriend on Feb. 4, and afterwards we found out that the condom broke. We immediately went to the pharmacy and bought Plan B--I took the first pill within an hour to an hour and a half of having sex. I took the next pill exactly 12 hours later, just like it said. My period was due "sometime" that week--but it's pretty irregular. I thought I started my period yesterday, the 12th, but it lasted less than a day. It was fairly heavy bleeding--but not as heavy as it usually is on the first day of my period. Also, I've been having cramps--even after the blood flow stopped. I'm not sure if this is my period, a side effect of Plan B, or both (Plan B causing a very short period). I've taken a pregnancy test and it came back negative. Could I still be pregnant, even after taking a test, not to mention taking the pills within an hour of the condom breaking? Also, how effective are HPTs--should I trust the results?
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