Letrozole wasn’t getting my OPK to peak. They would read high but wouldn’t peak. My OB said it didn’t matter but I went for a second opinion with an infertility specialist. We talked and I felt really good about him listening to all my concerns and agreeing with me that I should switch to Clomid. This is my OPK results just 6 days after taking my last Clomid pill and I couldn’t be more thrilled! So if you’re having trouble with Letrozole maybe try to switch. I’m in my TWW tomorrow!