Leterozole cause cycst

SS1

I took first time letrozole plus trigger shot it was bfn but today 2nd cycle I went for baseline ultrasound and found leterozole cause a small cyst so nurse said we can't do medication this month have to wait for next cycle for leterozole.

NURSE also said it's okay to ttc at home with medication. Anyone had same experience and without medication got bfp ?

Also what action taken to get a bfp