I had protected sex on 11/30 using a condom, but at that time I was not on birth control because my prescription expired. Within the following days I went to clinic to get a new prescription and begin taking my birth control pills that same day 12/5. I should have gotten my period naturally on 12/17 (I would just be starting week 3 of the active pills). I have not gotten my period yet as of today (12/20). Is this because of the birth control? Will I get my period during the inactive pills?