Having odd spotting and I don't know if its my period or I'm

Ok so here is my prob: I had unprotected sex about a week and few days ago (I know really stupid) & I'm not taking my pills cause I got them a week late since they cost alot of money and I'm waiting until after my period to take them. But I took the Plan B pill about 36 hours after having sex (it says that its most effective after 48 hrs) I actually chewed it in half and swallowed it but it didn't say wheater or not to swallow or chew on the box but apparently I had spotting 6 days after having sex and i know that its like six days after impaltention that you start to spot. However, I was getting symptoms of crankiness and becoming very pale before the "spotting" & now I'm back to normal (except I have a loss of appetite which is normal when I'm on my period)

Well the spotting was two days ago and since then its as though I have my period when I'm not due until next week (next wed.) but the way I had it was wierd. It was a brown medium flow the first day but then the next, it was heavy red the next day and I have slight cramps but they are so little at times I can't even feel them

Now I don't know if its heavy becuase of the heat here in NJ or if I've been implanted? Because that is the only sign I would have, I'm not nausied nor are my breast tender or anything else so can someone help me with am I pregnant or is it my period like my mom says?

(sorry its so long but I talk alot when I'm nervous)