Using oral contraceptives can affect the number of days your period lasts. Women who use oral contraceptives frequently experience shorter periods, as well as lighter flow. In fact, todays continuous oral contraceptives offer women the chance to menstruate four or less times per year.
Of course, anytime your period is excessively heavy, long lasting, or doesnt seem normal, consult your physician for advice.
See:
Things You Should Know About Menstruation
Frequency of Menstruation
8 Signs You Should See Your Doctor About Your Period
Source: Menstruation and the Menstrual Cycle; WomensHealth.gov; http://www.womenshealth.gov/faq/menstru.htm; accessed 07/21/08.
