Starting a new pack of birth control after a few weeks off

Patient: I have been taking Yasmin 28 birth control, and I was not able to start my new pack due to insurance problems. The first day of my last period was November 30th. I would have started a new pack on Dec. 4th, had I had them on hand.My question now is when should I start my new pack? Do I have to wait for my period to start again, or can I take it according to when I would have started the pack had I not been off the pill? (That would be Jan. 1.)Thank you!