Losing weight

With my past two pregnancies I've lost weight in the first trimester. Last pregnancy I was at 170 and by the time I was in the second trimester I was down to 160. This time I was 165 and I'm 150. I hate it though, the doctors always get mad as though I'm trying to lose it when I'm not! I actually eat MORE right now! I also feel uncomfortable taking pictures to document my growing belly since I get smaller first before my belly rounds out. Also since I'm smaller than I have been in years (I used to be 125 prior to my daughter when I was being force fed by my family since they thought I was "too small") I'm starting to not fit in any of my clothes. Anyone else lose weight in the first trimester too?