I feel compelled to go on the record that lesbians do not need to "switch sides" in order to get pregnant. Do you have a partner? How are they going to feel about this "switching sides" approach? You should talk to a reproductive endocrinologist about options that do not require you to sleep with people with whom you have no relationship or for whom you hold no attraction.
Best of luck to you. I'm sure off you keep writing with your doctor you will be able to get pregnant.
Did you start birth control to regulate your cycles? If so, the birth-control regime might increase your chances of getting pregnant once you got off of it. Have you talked to a doctor about this approach? After you stop the pills, use ovulation predictor strips to try to track when your natural ovulation is.