similar here, although my period used to be really fucking irregular since mid puberty, started to finally get regular (every two months) in my mid twenties… let me tell you this from my own experience (I bothered doctors a lot about this):
different doctors will propably tell you the same if you don’t have any other issues.
if they do come every two months in a rythm it’s not really irregular. some women react more sensitive to stress, nutrition, hormone changes through aging and whatnot, and having a slower period rythm is not that uncommon or neccessarily bad so just do your checkups and try not to worry too much about it, it will only raise your stress levels which can lead to futher irritation and delay in sensitive bodies.
If you are worried about your fertility you can test it. but really, don’t panic.
I understand that you’re sacred since it is a recent change, but having the period only every 2 months has it’s benefits and it’s totally possible for it to change again.