Can periods just shift?

For 4 months in a row my period has come around CD 42-45 instead of CD 30-35. Does that mean my cycle is 45 days instead of 35 from now on? I’m just unsure it’s something I need to go to the doctor’s for.

I’m 21 btw.. never had kids and haven’t been under major stress. Only thing I can think that I’ve done differently is take care of what I eat. TIA xx

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