Letrozole single follicle

This was my first medicated cycle on 5 mg letrozole.I only produced one dominant follicle. We did timed intercourse this cycle and are planning on doing iui next cycle. Should I talk to my dr about increasing the dosage to 7.5 mg? I’d really like to increase my chances if I’m going to spend the money on iui. I ovulate on my own every month, so i don’t feel like I responded well, if at all, to the 5 mg dose.