Unprotected sex: Irregular menses are rather common in young women. Engaging in unprotected sex throws another variable into mix whenever you're late. If you want to have a baby, continue to engage in unprotected sex. Otherwise, return to Planned Parenthood for some method of birth control that can also regulate your periods so you won't have to wonder. Still important for him to use condom to prevent STDs.
Answered 2/6/2016
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