Letrozole and ovulating later

Diane

Has anyone who has taken Letrozole ovulated later than they usually do.? This is my 1st round of 5mg, I have 25 day cycles, usually ovulate CD9/10 and get a few days of positive OPKs before. I am on CD 11 and still have not gotten close to a positive on OPKs and my bbt is still continuing to drop.