Is this normal?


Okay so for the month of September I had two periods which by the way isn’t normal for me. The last one was on the 23rd and I just started this months period but the app says it was suppose to start in a week. I haven’t been sexually active for about a year now so I know pregnancy isn’t the issue. But should I be worried? Since like the month of September I had two period and two weeks later I start October’s period. I know stress and diet can cause changes but I haven’t felt stress and my diet hasn’t really changed so yeah lol if y’all can give me a few pointers I’d appreciate it