Need an answer hopefully from a gyn....

I'm super confused my LMP was in march.... On may 2nd I had sex but after wards felt really wet and also felt like AF wanted to come down... But never did I only have had spotting very light brown only when I wipe.. Almost nothing vaginal discharge. Ive been spotting for about a WK now... Sometimes its light brown and then looks pinkish brown.... I took a dollar tree test on weds but it was late afternoon and I had drank some tea before. It was neg. I've been taking fertility blend and vitex for about3 months... I've been pregnant twice I have a son and I miscarried my second bby and had a d&c in June 2014... I thought my periods were gonna regulate but haven't I'm still irregular... I'm just confused this has never happen? I looked on the internet on vaginal infection &cervix infection/inflammation but I don't have the symptoms to neither.. CAN A PERIOD BE ONLY LIGHT LIGHT BROWN SPOTTING??(learn more on Glow: https://glowing.com)