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  2. Ovulation Calculator & Calendar - Determine Your Most ... - WebMD

    www.webmd.com/baby/healthtool-ovulation-calculator

    Your menstrual cycle can vary from month to month, and not everyone's is the same length. Use this calculator to see when you may be ovulating to find your most fertile days. Typically, you can ...

  3. How to Use a Menstrual Cycle Chart to Determine Fertility - WebMD

    www.webmd.com/baby/charting-your-fertility-cycle

    Once you have an average, subtract 18 days from the length of your shortest cycle. This is the first day you're likely to be fertile. Next, subtract 11 days from the length of your longest cycle ...

  4. Safe Period: How to Time Sex to Prevent Pregnancy - Healthline

    www.healthline.com/health/womens-health/safe-period

    An egg is viable between 12 and 24 hours after it leaves the ovary. Sperm can stay alive up to 5 days after having penis-in-vagina. Implantation of an egg, which happens after fertilization ...

  5. How Late Can a Period Be? When to Be Concerned - Healthline

    www.healthline.com/health/how-late-can-a-period-be

    If you’re 7 days past your expected due date, it is considered late. After 6 weeks, you can consider your late period a missed period. If your period is a day or two later than usually, it’s ...

  6. Implantation Calculator: When It Happened or Will Occur

    www.healthline.com/.../implantation-calculator

    Date of ovulation + 9 days =. Date of implantation (give or take a few days) Example: Say the first day of your last period (cycle day 1) was May 2. Your cycle length is usually 30 days. This ...

  7. Sunrise equation - Wikipedia

    en.wikipedia.org/wiki/Sunrise_equation

    Sunrise equation. A contour plot of the hours of daylight as a function of latitude and day of the year, using the most accurate models described in this article. It can be seen that the area of constant day and constant night reach up to the polar circles (here labeled "Anta. c." and "Arct. c."), which is a consequence of the earth's inclination.

  8. How Long Is the COVID-19 Incubation Period? - WebMD

    www.webmd.com/covid/coronavirus-incubation-period

    Takeaways. If you have been exposed to someone with COVID-19, you may begin to show symptoms after a 3-5 day incubation period. The amount of time will depend on the variant you were exposed to ...

  9. How Many Days Between Periods? Normal and ... - Healthline

    www.healthline.com/.../how-many-days-between-periods

    The average menstrual cycle is about 28 days. This means that about 28 days pass between the first day of your period and the first day of your next period. But not everyone has a textbook cycle.