My boyfriend and I have had sex when i had my period, we used protection,and i still had my tampon in. After my period was over, we had sex again but i saw that i had discolored discharge. It wasn't the normal color but it's not brown either. It's a light brown/pink color and i was thinking it was just my vagina cleaning itself out. I already took a pregnancy test and it came out negative so i was wondering if i should be worried?