I'm 26, nulliparous, no HBC in almost 4 years, currently an imperfect user of condoms with a male partner with a genetic condition that makes his fertility unlikely. Fairly regular heavy periods for the thirteen years since menarche, with accompanying cramps, etc (normal PMS). Obese.
Now! I have been having very light bleeding since the 12th-13th of January (a little early for my cycle, but within normal variation). It never really progressed beyond the amount of blood I would normally associate with the day before my period started, and about 80% of the time it is brown blood. No clot material (I usually pass small, O2-rich clots during the heaviest days of my period), never enough fluid to make a cup or tampon anything more than an exercise in chafing, but never more than 6-10 hours between needing to wipe away the bloody discharge.
I did have unprotected sex during my last ovulation cycle, but as I said, part of the phenotype of my partner's condition is a 95% occurrence of infertility in men due to absence of vas deferens. He's played his odds with other partners in the past and is as certain as possible (absent a sperm count) that he is infertile. Also, 25 continuous days of bleeding is a little excessive for implantation bleeding possibilities.
Any ideas? Hints?
[Edited for minor corrections.]