10 weeks with twins

👶🏽👶🏽👦🏽👩🏼👨🏽 • Wife and mother of a two year old boy! And expecting twin boys Aug 2015
So I went to my Drs appointment today, and come to find out, from two weeks ago till today I lost 6lbs?! I'm eating the same, and what I do thought the days have not changed at all. My questions is, could I not be eating enough??? That the twins are eating my body fat? Lol like seriously I'm confused as to why in the world did I loose weight?!