Congratulations, we are due around the same time - according to my dates I am due the 22/01/09 and that would make me today 4wks 4d so if your EDD is the 25/01/09 then you would probably be 4wks 1d and that result would be on the higher side.
It may be a mutiple but every pregnancy is different, you will just have to wait a few weeks till you can have an ultrasound and see.
Hope all goes well for you and you bub or bubs, keep me posted when you hear anymore news!
Cheers