Well, this is a new one. No idea what's causing it, but if the weight goes away in 2 days, what's the big deal? I would advise staying off the scale and go to weekly weigh ins, otherwise you can obsess in negative ways. Your weight loss should be a source of common pride and happiness between you and your DH - don't add a stressor you don't need. This is a WOL - if your vision of the rest of your life includes this self-imposed restriction, you'll have a hard time keeping to it.