Weight loss early third trimester?

Has anyone ever experienced weight loss in early third trimester? I have lost about 5 pounds since last Friday. Only thing I can really think of is maybe loss of fluid retention, I peed all night last night. I do eat pretty healthy, lots of protein and healthy fats, but I do make sure I eat an adequate amount of carbs also. I drink a gallon of water a day, and I do yoga and a light arm workout 5-6 days a week. My last growth scan 2 weeks ago my baby measured great. Just as of this morning I have only gained about 9.5 pounds total, when last Friday it was 14 pounds I had gained. I had a "normal" bmi to start.