I am a 30 year old. I was diagnoised with PCOS in feb and since then have been on metformin. I had my last period in the first week of may and had clomid on the 5-9 day of my period. since then i havent had my periods. Went to the doc today as i have been experiencing a dull ache in my left ovary area and have been using the WC more ofteh than before. The doc did an ultrasound in which my right ovary looked fine, left was larger than usual but the doc said its ok and uterus lining was 20 ..she said i maybe preg but the urine test was negative..please advise why else cd the uterus lining be so thick? the doc has asked me to wait for few more days...!