Welcome Kittycat - and thanks for the question about Femarra. I don't think anybody on this thread has used this drug before, so it's most interesting (to me) to find something new to research.
I found this website here, which I think you should definitely read to understand the drug you're being treated with:
Letrozole Femara infertility
My first question to your clinic would be why they chose Femarra instead of Puregon. I don't think there's anything wrong going on here! :-) But I for one would want to know why they chose a relatively new and untested drug over one that's been around for some time and has very good stats for success.
:-)
OP.