Fertility drugs and ovulation

Hey ladies, prior to this cycle I did three rounds of letrozol and one trigger shot. The hubby and I decided to take a break this cycle I didn’t use any OPK we had sex one on cd twelve. Now cycle day 20. Ever other month I’ve gotten my positive OPK typically on cd 14. I started doing some workouts and changing the way we are eating to help be healthier. For shits and giggles I took an OPK this morning and it was super close to positive and I took another tonight and it was a definite positive. My question is, would being on Letrozol for three cycles and then stopping it cause me to ovulate late? I don’t know what’s happening now since I didn’t check around cd 14.