TTC almost 4 yrs for baby #2

Emily • Hi! I`m 25 years old, married 5 almost 6 years. Been TTC almost 4 years and I`m about to give up hope.
My hubby and I have been TTC for close to 4 years. I take a prenatal vitamin everyday, hardly drink, no BC, and eat pretty healthy. My Doctor has told me to be patient and it will happen in good time, 4 years is plenty of time! She wouldn't prescribe any medicine. We just moved and are having a hard time getting insurance. I'm hoping a new doctor will help us, but it's taking forever and 44 month's with no luck is heartbreaking. I have had 2 BFP's that turned into BFN in just days. I don't even know what that's about. I'm beginning to loose hope. I have friends that have had two babies since we've been trying and it's killing me. What can we do or try!!?? Please help.