I am 32 years old, I am planning my baby now. I had gone through an abortion in March 2010 in the 22 week of my pregnancy. I have consulted a gynaecology doctor and got all tests and ultrasound done. All reports are normal only my thyroid (tsh) was 5.2 so doc asked to take THYRONORM 25 mcg and a folic acid tab. I am ovulating every month. I was having a 28 days cycle for years then it suddenly since last 3 -4 months it started to fluctuate sometimes 26 days sometimes 30 days last month it was 35 days. Why is this happening?