So my Obgyn that I started goin to back in March started me on Metformin 500mg once a day to regulate my periods. It worked but I will still unsure if I was ovulating so when I saw him back in June he increased it to twice a day. I'm currently almost two weeks late on my period and I have taken a couple pregnancy tests, one at 5 days late and one at 6 days late and they were negative. Could it just be the medicine making me late or is it possible I could be pregnant and my Hcg levels are just too low for the tests to pick up? Any ideas ladies?