Predicting Ovulation

Each month an egg is supported towards maturity by the hormones on the ovarian follicle on which it rests. Generally, a new egg ruptures and is released mid-cycle around day 14 or 15 after the first day of the last normal period. If the egg is fertilized and implants in the womb there will be no period. However, if fertilization does not occur then the uterine lining is shed in the next period, around 14 days later.

The most common and basic method of detecting ovulation is to use a monthly calendar. Mark the first day of your menstrual period and again when bleeding stops. Doing this for a couple of months will help you to understand your own biological patterns and the cyclic and predictable nature of menstruation. Although the average length of a menstrual cycle is 28 days, this can vary between individual women. Some have shorter or longer cycles. It is important to look for physical changes that indicate ovulation has occurred, rather than rely solely on calendar dates.

Having intercourse just prior to or at the time of ovulation will maximize the chances of conceiving a baby. There is only a small window of time—12 to 24 hours—where the egg is viable and capable of being fertilized. Sperm is much more robust than eggs and can survive 3 to 5 days after ejaculation. Fertilization normally occurs in one of the woman’s fallopian tubes. As soon as the egg has been fertilized, a signal is given off to the other sperm not to waste their efforts: there has already been a lucky winner.

An increase in your body temperature. Taking your basal body temperature first thing in the morning can be a good way to detect when ovulation has occurred.