PLEASE HELP

So I'm on a low dose pill, and every month seems to change. The last two months I had heavy discharge at the beginning of the month, and spotting mid cycle.
This month is my fifth month, and I got no heavy discharge, I'm hardly getting any. No spotting either and my boobs are really sore. 
The last time I had sex was two months ago, and it was protected with a condom and pulling out along with the pill. I've had two withdrawal bleeds since and I still worry I'm pregnant.
Is this just my cycle and body changing from the pill? My boyfriend tells me not to worry. My last period was slightly longer than my last, and ended in red blood instead of brown discharge. 
Does all this sound okay? IM probably not pregnant right? 

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