Girls merely please!?
Answers: if you've just started lately in the finishing year or so, it's normal because like mad of girls have irregular period.
I'd ask your doctor.
I doubt it's serious, but just within case.
It could be endomitriosis or something.
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Go see a gyno basically in luggage. I also doubt that anything is seriously wrong. if it is your first period, it will be vastly unsettled. it will take at lowest 2 years to settle. in the meanwhile, maintain some spare pads or tampons near you just within case it is impromptu. if you have discharge ( white fluid within your underwear) and your boobs hurt or you are moody, you will get your interval soon. if it is really worrying, go to your doctor but it is without a flaw normal!
You should unambiguously tell your gyno! use a axe