Definition - What does Ovulation Calendar mean?
An ovulation calendar is a tool which attempts to predict a woman’s ovulation period based on the length of their menstrual period. The calendars are used to help estimate the time when a woman is most fertile, thereby determining the best time to have sex or to be inseminated for pregnancy.
Ovulation calendars are not always accurate because they typically use averages and assume a woman has a 28-day menstrual cycle. Because a normal menstrual cycle can last from 21 to 35 days, ovulation calendars can at best can suggest a range as to when the most fertile days may be.
FertilitySmarts explains Ovulation Calendar
Ovulation happens when the ovaries release a mature egg into the fallopian tube, and it later moves into the uterus. The egg can survive for 12-24 hours in the reproductive tract where it can be fertilized by a sperm cell and can result in pregnancy.
The chances of pregnancy are highest on the day of ovulation, and a few days before. Sperm can survive in the fallopian tube for 3-5 days, so the best time to have sex or to be artificially inseminated would be this fertile window of up to 6 days, with the peak just prior to the day of ovulation.
Determining this fertile window is important because the timing of intercourse has a significant effect on conception. Among healthy women trying to conceive, nearly all pregnancies can typically be attributed to having sex during the 6-day period ending on the day of ovulation.
A normal menstrual cycle lasts from 21 to 35 days. The luteal phase, which is the time between ovulation and the first day of your period is typically consistent regardless of the overall length of a cycle. The luteal phase can be between 10 and 15 days long. This number is then used to count backward to determine the days that you are most likely fertile.
If your cycle lasts for 35 days and your luteal phase is 15, then the days that you ovulate on maybe days 17, 18, 19, and 20.
There are additional methods of fertility awareness such as examining cervical mucus, basal body temperature (BBT), cervical position and ovulation predictor kits that can help a woman better understand her own personal fertile window.