Ovulation help

Hi TTC buddies!

Any help appreciated. So this month is my first month on letrozole. I’ve been taking opk tests daily.

I assume my peak was 18th. Today’s is lighter than this one. would that mean I am ovulating now or ovulated

I have a blood test Monday to confirm as well if I did ovulate.

Another symptom I’ve had is slight cramp on the right side of lower abdomen last night and I have had clear CM today.

Thank you in advance and good luck with us all TTC!