Cycle 3 of TTC. How long did it take before your BFP?

I know there are many people out there who have been trying longer than I have, but cant help feel like i may not ever get pregnant again. I'm 36 almost 37 trying to conceive and I feel like there is something wrong with me. Is it because of my age? My last 2 pregnancies happened first try. I spoke to my obgyn the other day and she told me to see her after 6 months of trying. Will you please share any tips or tricks that worked for you? I take prenatals, iron supplement and I even quit drinking coffee.