Letrozole and monitored cycle

Bryanna • TTC #1 || Fermera: cycle #1 || 👼🏻👼🏻

I was on 5mg of Letrozole and going in 2x a week for an ultrasound and lab work. My baseline i went in and had 6 follicles at 4mm each. It’s been three weeks and I’m now on Gonal F 75IUs. I now have 19 follicles and my biggest ones are 11.5mm on each side. My follicles are growing extremely slow. Has anyone had a problem with their follicles growing slowly?