Early ovulation w/ letrozole??

I have longer cycles- typically 31-33 days, so it makes sense that my ovulation w/ and w/o Clomid (days 5-9) has been day 16-17. I was switched to letrozole this month, instructed days 5-9, but I decided to double down on the study evidence and took days 4-8. Anyways- I’m on cycle day 14 and have EW mucous, a morning drop in my bbt and an essentially positive LH. If not today, tomorrow.

Just wondering, out of sheer curiosity, if any of you ladies had earlier than expected ovulation with letrozole? Did it alter your cycle length? In 16 months of trying, I’ve never ovulated this early!