It may decrease absorption. Having diarrhea or vomiting means that the pill will get out of your system faster than it would in a normal person. Laxatives might have a similar effect.
Birth Control Pills prevent pregnancy by suppressing ovulation - without ovulation there is no fertile egg, so no chance to get pregnant. Some BCP also make cervical mucus thick which prevents sperm...
Before you start having sex or if you have really bad menstruations that make you stay home several days a month. Many women have been helped by them then.
I only know of two women that had fibroids. My Mom was one and my Mom's co-worker is another lady. They both were put on the pill, but that did nothing to help them. My Mom's continued to grow. She...