Day 12 Follicle Scan

I am on my first monitored cycle with letrozole (5mg, Cycle day 3-7).

I went in for my monitoring follicle scan today at cycle day 12.

They found 2x follicles on my Left ovary - a 19mm and 15mm.

And 1x 15mm follicle on my Right ovary.

Is this normal? Google says you should have 6-10 follicles - with 1-2 follicles being larger/dominant.

I have stage 3 endometriosis and a endometrioma cyst on my right ovary, this is why we have started some fertility treatment.

Would really appreciate if anyone knows much about what the follicles should be/how many?

Thanks xx