Lazy or pregnant?

Shannon
I'm 8w2d and work a job with long hours (at a desk) during the week. On weekends it's like pulling teeth to get me off the couch, I'm taking two naps and pretty much have zero motivation to get out and do anything. On top of that its about 8 degrees out so that doesn't help. 
I'm feeling so guilty and can't decide if I'm just being lazy or its pregnancy telling me to rest and catch up on sleep. 
Any thoughts? Or is anyone else going through the same thing?