when should a menstrual cycle start
Your menstrual cycle usually lasts about 28 days, give or take a few. This means that you should get your period about every 3 1/2 or 4 weeks. When you first get your period it can be a little wacky, like skipping a month or coming after only 21 days. After a while, your cycle will probably become more predictable. Quick Facts About Your Menstrual Cycle: