why does this happen????

So I've gotten my period since I was 11 1/2. I'm 15 now. It used to come every 3 months the first 2 years and now the past year it's been regular every 28-31 days. So 2 months ago it came 28 days. Then 41. Then 27. Now I havnt had it and it's day 32. What is going on? Why is it like this? I just want it the same time every month!!!!!!!!😒😒😒 smh

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