Can you get your period later than 31 days in the cycle if you always get it about the 26'th day?

Menstrual Cycle: Menstrual cycles can vary in length. The average is about 28 days, but some women have a shorter cycle and some women have a longer cycle. It is not always the same number of days every month. However, if you have been sexually active and your menstruation is late you should have a pregnancy test to determine if that is the reason you have not started menstruating.