Letrozole and Ovulation Timing Experience

Currently in my cycle for my first IUI. Taking Letrozole CD 3-7 (on CD 7 now) and then I go for my first ultrasound on CD 11.

In a typical cycle I would ovulate on my own without meds and get a positive opk on CD14/15 and then a temp rise 2 days after my positive opk and confirm ovulation from there with my bbt.

Wondering what to expect for my CD 11 ultrasound…

Did Letrozole make you ovulate early or later than you typically would have if you were already ovulating on your own?