One view: when it starts
Another view - The most fertile time in a woman's menstrual cycle is around the time that she ovulates. This is usually around day 12-14 of a 28 day cycle but if your cycle is shorter or longer then this may change. A good way to see if/when you ovulate is to use a fertility monitor / ovulation predictor such as Clearblue which detects when your LH (luteinizing hormone) level surges, usually indicating imminent ovulation.
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The most fertile time in a woman's menstrual cycle is typically around ovulation, which occurs about midway through the cycle. Ovulation is when an egg is released from the ovary and is available to be fertilized by sperm. It is generally considered the best time to try to conceive.
Fertility in the menstrual cycle refers to the window of time when a woman is most likely to conceive. This typically occurs around ovulation, which is when an egg is released from the ovary and is available for fertilization by sperm. Fertility can vary from woman to woman, but it is generally highest around the time of ovulation.
On the 14th day of a typical 28-day menstrual cycle, ovulation usually occurs. This is when the ovary releases an egg, which can then be fertilized by sperm. Ovulation is a key part of the menstrual cycle and is the most fertile time for conception.
The key difference between the menstrual cycle and the estrous cycle is that the menstrual cycle occurs in humans and some primates, while the estrous cycle occurs in most other mammals. In the menstrual cycle, females have a monthly period of bleeding, while in the estrous cycle, females experience a period of sexual receptivity known as "heat" or "estrus." Additionally, in the menstrual cycle, females can conceive at any time during their cycle, while in the estrous cycle, females are only fertile during specific times when they are in estrus.
A woman is most fertile around the time of ovulation, which usually occurs around the middle of the menstrual cycle. This is when an egg is released from the ovary and is available for fertilization by sperm. It's typically a window of about 6 days including the day of ovulation.
In theory you're least fertile just before menstruation.Take the average 28 day menstrual cycle:A woman would ovulate around day 14 and produce fertile cervical mucus for up to a week beforehand, so the most fertile point would be between days 7-16 of the menstrual cycle. After ovulation there's no egg to fertilize, by the time you're due to menstruate any egg is long dead.Unless you use Fertility Awareness Method you can't know when YOU are fertile or not, everyone has a different menstrual cycle and menstrual cycles can change all the time. You can't rely on an estimate or guessing fertile or infertile days based on previous cycles.