Am I crazy?

So my husband and I have decided to start trying to have a baby so I got off my birth control in may and since then I've only had 3 periods 2 of which have had to be forced by medication... I feel like something is wrong such as PCOS or an unbalanced thyroid? I have symptoms that would fit both of them. Anytime I bring this up to my gynecologist she just says that I am young and shouldn't worry... but when I am going almost 80 days between cycles and in 6 months have really only been able to try 3 times it is something I should be worried about! Should I just let things fall as they should or demand that they test me for one of these!? I don't know what to do I feel like I'm being crazy!! 😭