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This tool is designed specifically to help increase the odds of getting pregnant. It is not personalized enough to be used as a method of birth control.

This tool has been reviewed by medical experts and is for general educational purposes only. It is not a substitute for medical advice. The information in this tool should not be relied upon to make decisions about your health. Always consult your doctor with questions about your individual condition(s) and/or circumstances.

Source:
Savitz D, et al. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. American Journal of Obstetrics and Gynecology 2002 Dec. 187(6).