hormonal contraceptives are steroid hormones used for birth control. they contain a small amount of synthetic estrogen, progestin or different combinations of these hormones, that inhibit the body's natural fertility cycle and help prevent pregnancy.

normally, a pregnancy can occur when the hormones LH, and fsh,signal a woman's overy to release an egg. allowing a sperm to attach and fertilize it, hormonal birth control works by preventing the growth of an egg and ovulation, by preventing the release of l.h.and f.s.h.by the pituitary gland. contraceptives thicken cervical mucus so that sperm have a more difficult time reaching the egg. they also make it more difficult for the egg to attach to the lining of the uterus, a number of different types of hormonal contraception, including pills, patches and vaginal rings.

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