Confused!

I'm 6w3d and I have been so hungry I literally will eat anything in sight lately! The bloat is also real, like really real! I'm going to a nutritionist to try and help keep my weight gain at a minimal so I weighed in last week! I weighed myself again today on 2 different types of scales ( one being the scale she weighed me on) and I lost 3 pounds! I'm just confused as to how I did this when I've been eating everything, even stuff my nutritionist has told me not to eat! Her goal for me was to stay the same weight until 12 weeks then gain a few pounds in my second trimester and gain about 7 pounds in my last trimester to equal out to only 12 pound gain! Now I'm happy I lost weight but I don't understand how it's possible because I know I have not been eating how I should! This pregnancy has really thrown me for a loop, with my last 2 I was so sick I couldn't eat and this pregnancy is the complete opposite I'm so hungry I can't stop eating!