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    LGBTQ+ friendly fertility clinic.


    Monday to Friday
    8am – 4:30pm
    3661 Valley Centre Dr
    Suite 100, San Diego, CA 92130

    Fertile Window Calculator – Tracking Fertile Time

    Fertile Window Calculator

    When attempting to conceive a child, it is crucial to consider your most fertile days, also known as your fertile days calculator. Since a woman’s egg can only survive for up to 24 hours after release from the ovaries and sperm can live for up to five days in the vagina, the fertile window is typically six days. These fertile days occur in the five days preceding ovulation (release of an egg) and 24 hours afterwards. If you are hoping to become pregnant, it is best to perform intercourse at least three times on these six days.

    Fertility Calendar Method

    A fertility calendar is a standard method for understanding your most fertile days. It takes into consideration the average length of your cycle, to ensure your window is tailored to your body. You must track the length of 6 to 12 of your menstrual cycles, starting on the first day of your period and ending on the day before your next period. Typically, women ovulate 2 weeks before her next period and should plan for sex in the 4 days before ovulation.

    Basal Body Temperature

    The basal body temperature (BBT) is your temperature at rest. During ovulation, your BBT is likely to slightly increase, which is helpful for predicting when you will ovulate. Track your BBT for at least 3 months to understand your body’s changes and pattern. Make sure you record your BBT using a BBT thermometer every morning before you get out of bed.

    Cervical Mucus Calendar

    A few days before ovulation, the cervix produces a mucus that is thin and slippery, which helps the sperm travel to the fallopian tubes. Women can detect the pattern of their ovulation by checking their cervical mucus everyday for a few months. Plan for intercourse during days with clear and slippery mucus.

    Saliva Ferning Kits

    Before ovulation occurs, women experience a spike in hormone levels. With a saliva ovulation predictor kit, women can observe dried saliva to detect a fern-like pattern to determine their most fertile days. Partake in sex on the days with more crystal-like patterns.

    Urine-Based Ovulation Kits

    Urine-based predictor tests detect an increase in luteinising hormone (LH), a hormone released a few days preceding ovulation. By charting your LH levels everyday, you can predict your ovulation and fertile window. Plan for sex on the days in which your LH levels are higher than usual.


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