Pregnant?

I am on the pill (this is my third pack of pills) and I take it at the same time every day. I also use condoms every time I have sex. I take the combination pill every at at 7:00pm sharp. Today was the first day of my “period week”. It’s currently 10pm (3 hours after taking my ‘sugar pill’ and I haven’t started.... should I be worried? When do you think my period will come?