Why use contraception?
Contraception is necessary if you wish to avoid an unwanted pregnancy and sexually transmitted infections.
Every month a woman's ovary produces an egg. When a man ejaculates, his semen contains millions of sperm. It takes only one of these sperm to fertilise an egg and begin a pregnancy. If a couple has sex (penis in vagina) and do not take precautions, there is a high risk of pregnancy. Using contraception allows you to have sex and avoid an unintended pregnancy.
How Does It Work?
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. The Pill also works by thickening the mucus around the cervix, which makes it difficult for sperm to enter the uterus and reach any eggs that may have been released. The hormones in the Pill can also sometimes affect the lining of the uterus, making it difficult for an egg to attach to the wall of the uterus.
Can you use ordinary birth control pills continuously to prevent having a period?
It's possible to prevent your period with continuous use of any birth control pill. This means skipping the placebo pills and starting right away on a new pack. Some evidence suggests an advantage to this type of pill regimen. By continuously taking the pill, you prevent hormonal fluctuations that are responsible for bleeding, cramping, headaches and other discomforts associated with getting your period. However, you're at greater risk of breakthrough bleeding — bleeding between periods. Continuous use of your birth control pills works best if you're taking a monophasic pill — with the same hormone dose in the three weeks of active pills. If you're taking a triphasic pill — with a different hormone dose each week of the active pill phase — using them continuously carries a much higher rate of breakthrough bleeding.
You may find continuous use of birth control pills a convenient way to avoid having your period during an important occasion or trip. Taking a monthly regimen birth control pill continuously is fine for about three months, but then you should plan on taking the placebo pills so that you'll have a menstrual cycle.
