One follicle after stims, more before stims started?

Nia

I had an ultrasound two days before starting stims ( though I started microdose lupron that day). It showed 3 right follicles and 1 left. Today, after 3 days of stims there was only 1 follicle on the left and none on the right. Seriously?? Can they just disappear?

I’m not expected to produce a ton of follicles, but this is ridiculous!