I am overweight and have never had regular periods until the past couple of months when I began losing weight... I ovulated May 19, then 14 days later I started my period... 14 days later (June 17) I ovulated again and My husband and I had sex the 16th/17th. this past tuesday (27th) i began spotting a pinkish color. On the 28th, it was mainly a clear mucous with small streaks of blood, then today it is very very very light blood. It is so light that I wore a panty liner and none of it even got on the liner. It seems to be dissipating. Since I have never really had periods, I am hoping it is implantation bleeding and not just an irregular, light period. My normal periods last days and I go through about 4 pads a day (just an example of the heaviness) Has anyone experienced this? I took a preg test, but it said negative;however, I am afraid it is too soon before my period for it to work. according to my calc, i should start Sunday.