How Does Pregnancy Occur ?
The female reproduce system involves the uterus, ovaries, fallopian tubes, cervix and vagina. Yhe female hormones, oestrogen and progesterone produced by the ovaries, rise and fall during the month and cause the menstrual cycle.
In the first half menstrual cycle after the menstrual period, the oestrogen produced by the ovaries repairs the lining of age uterus. At the same time, an egg (ovum) in one of the ovaries matures. At about day 14 of a typical 28-day cycle, the egg leaves the ovary. This is called ovalution.
In the second half of the menstrual cycle, the egg begins to travel through the fallopian tube towards the uterus. Progesterone levels rise and thicken the uterine lining to prepare for pregnancy. If a woman has had a sexual intercourse at around the time the egg is released, the sperm travels from the vagina to fallopian tube where it fertilizes the egg; this is called fertilization.
The male & female gametes (sperm and egg respectively) fuse multiply and after approximately 6 days of fertilization these from a cluster of cells which gets attached in the uterus; that’s when the woman is said to be pregnant. There is continuous release of progesterone which helps maintain pregnancy. thus giving a temporary break to the monthly periods.