Well darn…being older would have made this easier! ☺️ We can blame everything on menopause.

Has anything changed in your life over the past few months? More stress, increased exercise? How many cycles have you gone through since this began?
Did you have a Covid vaccine? There have been reports by young women of a change in their cycles after having the vaccine.

Tossing out another link to abnormal periods for you. Not saying that yours are abnormal but they have changed. Generally if periods are becoming more inconsistent over a period of 3-5 months it might be time for a visit to your friendly gynecologist.
https://my.clevelandclinic.org/health/diseases/14633-abnormal-menstruation-periods