Weight loss at 33 weeks?

Melissa • Mommy of 3 boys! Suffered a miscarriage in October of 2016 and just found out we're expecting again!
Just had my bi-weekly appointment and have lost 3 pounds in 2 weeks...the Dr didn't say anything and I dumbly didn't ask...This is my third pregnancy and I don't remember this happening with my other two? 3 lbs isn't a lot, but figured I'd have gained 2-3 or stayed the same if anything. Has anyone had this happen?