Base from the chart I've seen, which is over the net right now, bitcoin's price always fall during this period.
If you bought your bitcoin in December, you might want to hold for a little bit longer. For sure, you bought your bitcoin to gain a profit thus panic selling won't do you any good.
You must put in mind that bitcoin's price is so volatile. Don't check the price every now and then. You will just get stressed. Checking it weekly is better.