text: if i start taking birth control and i don't know i am pregnant will i have a period.?   if you are not pregnant, then you will get your period. if you are pregnant, this is bad. this can cause birth defects in the baby, because this is just "birth control" pills... this is not "abortion pills" and if you are pregnant, please don't use the latter option... take good care of yourself... don't take any medications, don't drink, don't smoke. if you don't want a child, give it up for adoption. give the baby a chance to choose his/her life.  trivia: 2 weeks after conception, there is a heartbeat in a 2-week-old fetus. if people respect trees and animals so much, why not respect a fetus with a heartbeat?