I have been ttc for 6 months.  My cycles have been between 34-43 days. They keep getting longer.  I used opks for the 1st time this month and today is cd 29 and still no positive opk. So im wondering if my cycle is getting longer or if i havent been ovulating this whole time... It sucks that most ppl have 2 cycles in my 1.. I am also slightly underweight(runs in my family ive always been tiny) 103lbs and 5' 4. My bmi is a 17. So that could be another issue. I have a doctor appointment scheduled for april 17 but could really just use some encouragement and a friend who is going through the same thing...