my periods were really irregular and over the years I stopped trying to track them and so when i went to the doctor and told her I dont know when my last one was(i was not sexually active) she told me to just start to take it and that my body would adjust. I did and the third day into it(i was very good with taking it on time) I had sex with my boyfriend. We used a condom. But I am not onto my 5 white pill and no period... this is my first birthcontrol..should I be concerned?