hi ashley:sorry,i look for "birth control pill" in my handbook. i don't know this pill.i guess that it's relation to estrogen. 1);i don't know if cah girl has menstral cycle as normal girl.2):if cah girls need medicine to help their menstral cycle.3):if their need it,how old does she begin to eat?from this board i know you and Mara.i feel very happy. good lucky to you. thank you again.yong yan