Birth control pills are daily pills that contain hormones to change the way the body works and prevents pregnancy. Hormones in the pills control the ovaries and uterus. Most of these birth control pills are a combination of estrogen and progesterone hormones to prevent ovulation -- the release of an egg during the monthly cycle.
Until a woman ovulates she cannot get pregnant as there is no egg to be fertilized. It sometimes works by thickening the mucus around the cervix, making it difficult for the sperm to enter the uterus and reach any eggs that may have been released.
Most pills come in a 21 or 28 day pack. One pill is taken each day at around the same time for 21 days. Depending of the kind of pack, one may either stop the pill for 7 days (in case of a 21-day pack), or may take the pill that contains no hormones for 7 days (in case of 28-day pack). Periods arrive when a woman stops taking the pills that contain hormones.
The frequency of a woman’s period can be decreased by taking another type of pill for 12 weeks and then inactive pills for 7 days. It decreases the cycle of periods to one every three months, instead of one every month. Another pill that reduces the frequency of monthly periods is the low-dose progesterone pill, also called the mini-pill. This pill contains only one kind of hormone. It works by changing the cervical mucus and the lining of uterus or by affecting the ovulation. It should be taken regularly at the same time without missing even a single day. This pill may be less effective at preventing pregnancy.
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