It is possible, I have had a lot of friends get pregnant right off the pill. I was on it for a few years and had a period right on schedule, but it is hard to tell with the pill how your body will react coming off it. I would take a test.
It is very possible you could be pregnant. I came off in October as well and had a positive HPT, I just miscarried but that had nothing to do with the pill. I would go and see your doctor.