Confused... Scared... Help.

So my boyfriend and I have been having unprotected sex... I am on my brown pills in my birth control pack. I was supposed to get my period this past Friday when I took the first brown pill and I didn't I usually get it within the first 2 days of me taking my brown pills. I am now on the fourth pill with three more To go and I have not had an symptoms that feel like I'm getting my period at all... Should I be worried? Is it possible I can be pregnant right now and that's why I haven't started bleeding?