Got a positive opk yesterday evening and a negative this evening. Normally I test in the morning and get positives cd 12/13 and this time got a positive cd 11 and neg cd12 not sure if it was the letrozole or just difference in when I took my test. How are you ladies getting close to o??? Praying for bfp this month for everyone. When do you ladies test morning or evening? I have tested morning time I've done it in the past yr so not sure if I would get the same results if I always tested evening or what.