[jaybear12]

I got my period on Thursday (1/5/12)and it basically stopped on Saturday. Thursday and Friday were normal (like normal, heavy flow, painful cramps, bloating) but on Saturday, the heavy flow was gone, there was almost nothing on my pad when I would use the restroom and just the brown sort of blood came out when I would urinate (like what normally happens at the end of my period). It is now Sunday, and it's basically exactly the same as Saturday. My period normally lasts 4-5 days. My last period was at the beginning of December and that one lasted probably 5 days. My normal period consists of heavy flow on day 1 and 2, lighter on day three and sometimes 4, and almost nothing on day 5. The last time I had unprotected sex was probably 2 or 3 months ago, and that was on the last day of my period. All of my periods after that were completely normal. The last time I had sex with a condom was 2 or 3 days after Christmas. Between my last period and this one, I haven't been having sex as often. Could that be a cause of a shorter period? I haven't really changed my diet at all, I am stressed the majority of the time, I have been hit in the stomach a few times (I ran into a counter corner, got hit by a foot ball and other sports balls a few times, etc.), I haven't gained any weight or lost any weight, I haven't been drinking as much water and I don't really get much sleep. Oh and 4 months ago I took the plan B pill.
I'm just worried that something's wrong. Is this normal to happen? Any idea what could be wrong? Could I be pregnant? Thanks for your help and opinions!