My cycles have been pretty normal my whole life. In
October my period came on the
1st. It was normal. In
November, my period didn't come until the 15th, last only about 3 days and was pretty light. In December, my period didn't come until the 22nd and lasted only about 6 hours and was basically just spotting. For January's period, it was very light on the 9th, lasted for 36 hours.