 [ Symptoms ] is it birth control or possible pregnancy  birth control question  i had unprotected sex nov 21 and then i started my birth control that following sunday nov 22 i had completed a week of the birth control my period was expected the week after but it never came i have never missed a period and i have been on plenty of birth control is this the work of the birth control or something else i am on sprintec serious answers only please [ Disease ] hi its just you bc pills doing there job its when you get onto the placebo pills that you get your period as you should know having been on them before just google the working of bc pills its all there good luck