Help! Symptoms or no symptoms

Hi everyone,

I have no idea which category this should go in.

I'm just curious if maybe more people have experienced this. My last real period was on July 23. I had sex around August 2 or 3. (Unprotected because I started the pill late.)
So that's almost 2 weeks after my period. I didn't have any symptoms during that time. Until I was supposed to get my period again : I only had a little bit of brown blood, which lasted about 4 days. I did have a little bit of stomach pain for a few hours, like I always get when I'm getting my period, but not nearly as bad. I also feel occasional very low stomach pain and itchy nipples now.
I know I should just take a test, but I'm just curious if maybe more people have had this.