Help me😓

So I am a 13 year old, and I got my first period like last year, around August 2023. I was in India visiting family at the time, and the my cycles were regular till around October, and then it just completely stopped. It came back once or twice, like around midway this year, but I haven't had my period since then. I am really worried as I am overweight (around 15kg from ideal weight for my height), and I have heard that your periods can stop if you are not in shape. I have an appointment with a doctor to address this issue in about a month and a half, but I just wanted some information... Is this normal? Iam just really scared😕