I'm facing a problem since last month. I'm 25, married for 1.5 yrs. Taking medication to treat PCOS as recommended by my gynecologist. Last month and this month,3-4 days after my period, I see dark blood sometimes when i go to the washroom. Its not all the time and doesn't always show when I wash. Sometimes I can see it in my clothes too. This is supposed to be my fertile window but again like last month, this whole dark blood stain on clothes is scaring me.