The active pills prevent pregnancy and stop the menstruating process. Thats why there is a week of non active pills to allow the body to go through it's cycle of having a period and clearing out any lining of the womb that may have built up. It's okay to menstruate during the one week of different colored pills. If you are experiencing break through bleeding during the other 3 weeks, you need to go see your doctor and tell them. You might have to be put on different pills or a different dosage. [ Dragonflymagic's advice column | Ask Dragonflymagic A Question ]
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