Losing weight at 35w?

My weight gain definitely slowed in the third trimester but today when I weighed myself I had actually lost 1.5 Lbs since last week per my scale. I did reset and take it twice to be sure too. I go to the doctor on Friday which will be 2 weeks since my last appointment so I can ask then but is it common to start to lose instead of gain towards the end? I am eating and nothing has really changed. In fact I’d say I am moving less than I was before due to being tired and the aches and pains. I do have GD as well so my diet is very restricted.