Concur with Mr. K and T53417.
Also?
No, that's not how hormonal birth control works. "Low dose" doesn't mean that they are less effective. She either took antibiotics (which lower the efficacy of hormonal birth control) or did not adhere properly to her schedule for taking the pill. You have to take them every single day. Miss one, and you may find yourself with a passenger. The vast majority of "contraceptive failures" are due to user error.My daughter was on a low dose birth control pill that did not work and she became pregnant.

