Hard to say.. C doc: Normal cycles range from 2 to 7 days on average. You are still within the normal range. Many get changes in cycle length through out their reproductive life . Given that your changes seem a bit abrupt other issues could be possibilities. Pregnancy is the biggest consideration but stress, dietary changes and other hormonal triggers are also possible. Cytotec (misoprostol) use and past T.O.P. can also alter flow.
Answered 7/20/2014
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