Birth Control & Period Irregularities: What to Expect After a Change

Question
I'm 23, no children and have been on BC pills for about 4 years now.  I started my last period at the end of November.  My problem is that we recently relocated and changed doctors/insurance, and I finished my last pill pack about a week before my first appointment.  I am married and we don't use any other bc.  I mentioned this to my doctor, and he didn't seem concerned.  He also changed my bc from Mircette to Norinyl due to insurance.  This week I've been spotting (which has never happened before) and I still have another weeks worth of pills before placebo.  Should I be worried that I'm pregnant?

Answer
As long as you have been taking the pills every day, you will not become pregnant. If you do not get your period by the middle of January, take a pregnancy test. You did not mention the date of the first day of your last period. HOwever, if you started the new pack a week later than you should, you may have ovulated in mid-December. If you did become pregnant at that time, a pregnancy test will not show a positive result until 14-21 days later. The best time to take a pregnancy test is seven days after you miss your next period. Don't worry.