Nervous about dr appointment! Irregular/long cycles

Hey everyone I'm going to my appointment with my obgyn to discuss my irregular and unusually long cycles. I had gone to an appointment with the PA a month ago and she ran a few labs (prolactin and TSH) and ordered a pelvic US all of which were normal. She also recommended that I see my OBGYN. It took me a month to get an appointment with her so today is the day. My husband and I have only been TTC since December so only 6 months. But the fact that I haven't gotten a period in 75 days and before that they were very irregular is so frustrating. I was on birth control for 10 years before coming off in December but the PA said that shouldn't cause me not to have a period for a prolonged time. Does anyone else have experience with this situation?