Period comes way too early??!!

Mary • YOU CAN. END OF STORY✨

ok girls so it's the 2nd time in a row that my period comes WAY TOO EARLY. It usually comes 3 weeks and some days between one and another.. but these times it comes every 2 weeks !!!😨😨 I don't know why. Either it's because last year I didn't have period twice in a month (it usually happens two times a year so it regulates but last year it happened only once) or I don't know. Am I overreacting?!