Letrozole with Gonalf?

Nicole • Married 3 years! 💞 TTC for 3 years. MC 11/15. BFP 3/16. First baby due December 1st, 2016!!!
I'm about to start my third cycle of Treatments with an IUI and wondering if anyone has ever done Letrozole as well as Gonal F? 
I haven't asked our doctor yet if this is an option, but wanted to see if anyone has done so? It's pricey, so I'm looking for feedback.