Couple years in TTC

My husband and I have been trying to conceive for a couple years now. I have tried many different over the counter medicines to help with fertility. I also keep tract of my ovulation days not just with the app but also the ovulation tests. I have altered my diet and exercise also trying to see if that would help. Still nothing. I went back to my OBGYN and she basically shoved my worries to the side saying that I am still young(24) and used the fact that I have a son(5) as a reasoning on how she knows I can reproduce. She didn’t check me, do any tests and didn’t even offer anymore suggestions on what I could do to help myself conceive. So I am asking anyone out there who has had the same problem, what did you do to conceive? What did you take? TIA