Thanks so much for your post! Hopefully my BFP will come soon!
A topical cream will not effect your ability to conceive.
You only have a 25% chance of conceiving in a given cycle so they fact you havent gotten pregnant after 3 cycles is very normal and nothing to worry about. If you dont get pregnant after a year of trying, make an appointment with your doctor.
By the way, be sure to start taking prenatal vitamins even though you arent pregnant yet.