A cycle is between the first day of menstruation and the first day of the next.In a normal 28-day cycle, ovulation takes place in 14 days.

In a long cycle of 35 days, takes place on day 21, but fertilization may occur during the days preceding ovulation.

It usually occurs in the middle of the menstrual cycle, or towards the 14 days for a cycle of 28 days.

Since the implantation of the fertilized egg, the pregnancy hormone called human chorionic gonadotropin (hCG) begins to be secreted.

At the same time, the rates of the hormones estrogen and progesterone rise, preventing the loss of uterine lining.In a normal cycle when you are pregnant, rates of these hormones fall and have normal menstruation.

How long does the fertile period?The same extends an average of two days before and after ovulation.

Chorionic gonadotropin, or hCG, or more commonly called beta-hCG, a hormone secreted by the trophoblast (the cell layer present at the very beginning of embryonic development and that will give rise to the placenta) at the time the embryo is installed in the uterine wall.

The amount of hCG present in your body doubles every 2 or 3 days, reaching a maximum rate to the 7 or 12 weeks of pregnancy, then decrease.

Often women, eager to become pregnant, they may have a pregnancy test to confirm it, but beware, it will take about 6 or 7 days for a fertilized egg that passes through the fallopian tube to reach the uterus.

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