The birth control pill works as combination pills, this means that the pill contains a combination of hormones, estrogen and progesterone to prevent ovulation. A woman will of course not get pregnant if there is no egg to fertilize. The hormones in the pill prevent ovulation which means that it prevents the release of an egg during the monthly cycle. The pill also works by thickening the mucus around the cervix; this makes it difficult for sperm to travel up to the fallopian tube or uterus where conception takes place. Also at times it may affect the lining of the uterus, making it difficult for an egg to attach to the wall of the uterus, therefore preventing pregnancy. Most birth control pills are "combination pills" containing a combination of the hormones estrogen and progesterone to prevent ovulation (the release of an egg during the monthly cycle). A woman cannot get pregnant if she doesn't ovulate because there is no egg to be fertilized.
Most combination pills come in either a 21-day pack or a 28-day pack. One hormone pill is taken each day at about the same time for 21 days. Depending on your pack, you will either stop taking birth control pills for 7 days (as in the 21-day pack) or you will take a pill that contains no hormones for 7 days (the 28-day pack). A woman has her period when she stops taking the pills that contain hormones. Some women prefer the 28-day pack because it helps them stay in the habit of taking a pill every day.
Another kind of pill that may change the number of monthly periods is the low-dose progesterone pill, sometimes called the mini-pill. This type of birth control pill differs from the other pills in that it only contains one type of hormone — progesterone. It works by changing the cervical mucus and the lining of the uterus, and sometimes by affecting ovulation as well. The mini-pill may be slightly less effective at preventing pregnancy than combination pills. For the first 7 days of taking the any of the birth control pills, a girl should use an additional form of contraception, such as condoms, to prevent pregnancy. After 7 days, the Pill should work alone to prevent pregnancy. But continuing to use condoms will protect against sexually transmitted diseases (STDs).
If pills are forgotten, a girl is not protected against pregnancy and she will need a backup form of birth control, such as condoms. Or she will need to stop having sex for a while. Do not take a friend's or relative's pills, some pills may be for you some are not always play safe, always consult your OB-GYNE if you have any concerns or problems.
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