ttc baby #2 with letrozole

I saw a fertility endocrinologists yesterday. I had a consultation and did an ultrasound to see were i was in my cycle.. long story short im currently cycle day 33 not prego.. and she started me on letrozole... because she said my linening looked good and she didnt needed to bring on a cycle.... has anybody been through this?

I do have PCOS and my first was conceived on letrozole too but we always did a period first then cycle day 3-7 .. not day 33 it just seems weird to me...