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The increased blood-flow collects in pools (venous lakes) inside the uterus which fill up and then burst.
The endometrial lining then disengages from the uterus to produce the menstrual flow.
Environmental factors such as toxic waste or air pollutants can severely damage or even kill a woman’s ability to conceive.
To calculate the beginning of a pregnancy, a doctor will normally count from the first day of a woman’s last menstrual cycle.
The progesterone causes the lining of the uterus (endometrium) to secrete mucous.For instance, a person’s age, health and nutrition all have great influences on their body’s ability to be fertile.Because of the body’s response to stimuli, a more mature woman will not produce as many viable eggs as a woman in between her twenties and early thirties will.After a few successful years of marriage, they decide that it is time to have a baby.They stop using birth control and impatiently wait for the good news.