I’m so confused

Ashley

I started taking letrozole this month so I thought I might as well do BBT to and I wish I hadn’t because I’m so confused. Yesterday I had all the signs of ovulation: ewcm, a little cramping, temp drop, but I had a very negative OPK. This morning I had a temp spike but a very VERY POSITIVE OPK? What am I missing here? Do I need to just keep temping.

Thanks for any insight!!