Harvard students who fell asleep during their high school sex ed birth control classes.
About 42% of the women who get abortions, were using a contraceptive when they got pregnant.
Some of the side-effects of long-term Pill use are bloating, weight gain, depression, increased risk of STP's (HIV and gonorrhea), loss of sexual libido, and venous thrombosis (sexy, hey?)
And for those who may have these niggling, residual scruples about killing your youngest offspring: All hormone-based contraceptives can cause early abortions.
They interfere with implantation of the embryo, or cause the uterine lining to shed following implantation. That's why some scientists prefer to call them "contragestives," not "contraceptives."
Bottom line: (1)don't use hormonal birth control. And (b)don't have sex with somebody you don't want to have a baby with.