I ve 32 days cycle but last month I got my periods after 26 days but it was strange period not even lasting for 2 days but I had clotting when i peed but not very heavy bleeding. I ve pcos so my doctor put me on metformin 500mgx2. The thing is I should be getting my periods on 7th dec but I m two days late and still no period. My husband was not there during ovulation so is it possible that I had got pregnant last cycle only but had periods. I checked on 7th and tests were negative. Or is metformin making my periods late?