Answer:
up to 1/2. Between one-third and one-half of all fertilized eggs never fully implant. A pregnancy is considered to be established only after implantation is complete.
No eggs are fertilized if there is menstruation, and only one egg leaves the body during menstruation.
During this period, an egg - a female reproductive cell - grows and matures inside an ovary. At the same time, the ovaries produce hormones that favor the development of the layer that lines the uterus, called the endometrium.
With this information, we can conclude that no eggs are fertilized if there is menstruation, and only one egg leaves the body during menstruation.
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