In all other animals, however, this shedding does not occur, and the thick lining of the womb merely returns to the thinned-out condition, marking the beginning of the next cycle. If it is positive, i. The egg literally swallows the sperm as these two microscopic entities initiate the development of a new human being. Sperm Survival In Cervical Fluid The longest that sperm can survive in fertile egg-white cervical fluid is five days. The membrane that surrounds the egg within the zona fuses with the membrane of the sperm, and the sperm and the egg become one. If a pregnancy has been achieved, seven days after fertilization, the embryo begins to secrete the hormone HCG human chorionic gonadotropinand this HCG stimulates the ovary to continue to produce progesterone and estrogen, which are necessary for the maintenance of the lining of the womb.
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Sperm then continue to invade the cervical mucus at that point much like a single-file line of army ants.
How to Get Pregnant – Ch. 1: Natural Pregnancy
To understand how this invasion of sperm gets launched effectively, we must first understand the remarkable liquid that covers the opening of the womb-the cervical mucus. Although the FSH stimulates all of the developing eggs during the month to form follicles, one of the eggs always gets a head start over the others, and once it obtains that lead it never relinquishes it. When the baby is ready to be born, the muscles of the uterus contract during labor to squeeze the baby out into the world. Normally the HCG doubles every two days for the first month of pregnancy and reaches astronomic levels. After nine months, the baby is ready to be pushed out of the uterus by the mother during labor.