Would the RE know?

I started Letrozole this month for the first time. I had an ultrasound done to check how things were progressing on Wednesday. My RE stated I have 1 follicle at 17mm and 2 at 13mm. She also said I'd be ovulating in a day or two. I was out of opk and wasn't able to pick any up until Friday. So I tested yesterday & today. BFN. So did I miss it or is it still coming? I've definitely been feeling different since taking it. My RE would know when I'd be ovulating right? Do I keep testing or stop? I have been BD with my DH this week hoping we don't miss it.