Took Letrozole and no positive opk on CD 20! Help!!

Lo • Wed, Jan 02

I didn’t take ovulation test till CD 14 cause I usually ovulate on CD 15 or 16 but I haven’t had a positive yet and I’m on CD 20! I just keep BDing just in case but we need a break!! Is this letrozole messing up my ovulation?? Only 2nd month using it.