Unlikely: The pre-natal vitamins are an unlikely cause of the irregular periods. It is good that you are planning ahead and taking pre-natals. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx Practice safe sex.
Answered 12/27/2016
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