Struggling to stay motivated at work

Is anyone else struggling to stay motivated at work?  I took a couple of weeks off over Christmas and am back in the office feeling super distracted and unmotivated.  I'm finishing work at the end of March so it's hard to motivate with yearly plans etc.  All I can think about is what I need to buy for the nursery, or put on the registry, or labour and delivery, or what what it will be like to be a mum etc!!  I'm usually really hard working.  Hopefully I get back in to things soon!