Regular cycles?: The average menstrual cycle length is 28 days from the start of one period to the start of the next. If your cycles are regular (the same from month to month), you can expect your next period to come 4 weeks after the last one started. From your question, it sounds like this will be around 1/28. If you are sexually active and trying to avoid pregnancy, be sure to use a good birth control method.
Answered 3/23/2012
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