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The National Infertility Association, Resolve.org: "The Menstrual Cycle," "Tracking Most Fertile Time," "The Impact of Environmental Factors, Body Weight & Exercise on Fertility."
American Pregnancy Association: "Understanding Ovulation," "Ovulation Calculator: How to Track Ovulation," "OV-Watch Fertility Predictor," "Pre-Conception Health for Men."
UptoDate.com: "Evaluation of the Menstrual Cycle and Timing of Ovulation."
The Jones Institute for Reproductive Medicine: "Fertility Tests -- Ovulation," "In Vitro Fertilization (IVF)," "Ovulation Induction (OI)."
News release, National Institutes of Health.
American Society for Reproductive Medicine: "Patient's Fact Sheet: Weight and Fertility," Age and Fertility: A Guide for Patients."
Womenshealth.gov: "Healthy Pregnancy: Trying to Conceive," "Pregnancy Tests."
Eskenazi, B. Human Reproduction, February 2003; vol 18: pp 447-454.
Hassan, M. Fertility and Sterility, June 2003; vol 79: pp 1520-1527.
Mayo Clinic: "Symptoms of pregnancy: What happens first."
Reviewed by Traci C. Johnson, MD on January 11, 2018
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