My prescription for my birth control ended in September. I had my last period on the pill on Oct 9th. I heard that your cycle will either continue on the schedule it's on or will be irregular at first once you quit birth control. It seemed that my period came back right on time (Nov. 7th) and lasted the usual length. My cycle seemed to continue regularly. My husband and I had unprotected sex after my period and he "pulled out" every time. It's now nearly January and I still haven't started my period. I took a home pregnancy test a couple of days ago and it was negative. Do you think I could be pregnant? I have had one child already, but have not had any of the symptoms of pregnancy that I had with my first child.

You could still be cycling off your BCP. It could take several months before it will regulate. I just did in October, the first cycle was "normal" like I was used to having on the pill. The next cycle was 33 days, the next was 24. It can take several months.
Wait a week and if AF doesn't come, test again.