Like say August 2018 was a 30day cycle

Sept 2018 was a 42 day cycle

Nov was a 45 day cycle ( I got pregnant in Oct and had an early loss)

Dec was a 36 day cycle

Jan was 40 day cycle (no period in Feb)

March was 27 day cycle

I never considered my period coming early as it did because I always suspect it to be late hence to all my longer cycles because I'm use to having them but it came has a shock to me. I never had a normal cycle that isn't 30 days and up. But if my Jan cycle was 40 days then how could I have a 27 day cycle?