Don't really know what to think. AF started Feb.3rd. Took Letrozole 5mg from the 5-9th (CD 3-7). I've been using OPKs since Sunday the 11th (CD 9) and still not even a hint of a line. These tests are supposed to be the line or no line to detect LH surge, but also show that faint lines do not indicate a surge. I get nothing. Am I out? Would Letrozole push my ovulation back? keeping in mind I usually have a 28-29 day cycle and my last one I was 10 days late for AF. So would that have anything to do with it? HELP!!!!!!!!