Absent Menstruation

I have been to my doc once for this issue- she said stress is the cause. I haven’t had my menstrual cycle in 15 months, I talked to her about it a little before I made a whole year without it. I’ve had no bad symptoms. The whole 15 months have been using only condoms and no other birth control. I did stop birth control abruptly, I didn’t phase out of it. And noooow I want a baby. Google scared me with the symptoms and diagnosis of tumors, infertility, scarring. Anyone have any insight on this? I scheduled a doc appointment but can’t get in for 3 weeks. They aren’t considering this as urgent. I’m really worried though.