Weird period ?!

AC • ?
For the past two months me and my BF have been having unprotected sex (pull out and sometimes we don't even do that). I'm very aware of what could happen. We don't have any STDS so please don't say it could be that lol. 
​Anyway, my periods have been very light and lasting only two days. Last month I only bled for a day and a half and the rest was brown. This month 3 days and it's just been pink. The second day was red but not super heavy. I took a test 6 days before my period this month and it was negative.  Has anyone experienced this? 
Oh yeah( the color in my areolas have gotten darker and my periods usually last 5 days. I've felt nauseated and some smells really bother me.  I just think it's weird.