Letrozole question?

Saffiya • 34 year old with pcos. Married to my bestfriend and a mother of 2 and 🤰🏽

So I have a question. Has anyone who taking letrozole know the cycle day they were on when they got a peak? I’m on cycle day 12 or 13 and have taking an ovulation test and it’s still negative. Now I know they may still be early but any advice will be greatly appreciated.