I was crying hungry all the time when pregnant. One day I just decided to eat until I wasn't hungry and never got there. 20,000+ calories later never got there. I ate 5 steaks, 1 quart of saag paneer, $100 worth of sushi, 10 sammies, 2 omelets, 1 bag of french fries, 2 slices of cake, 10 bowls of soup (home made beef barley, plus chinese "mother's soup", plus miso soup), 1 pizza, a bag of carrots, 3 heads of broccoli, 1/2 gallon of milk, collard greens, mushrooms, a pot of coffee, half a package of frozen blueberry waffles, 1 lb of strawberries, and something I picked up at mcdonalds. With catsup.
And I was still hungry.
For ME... I had been dieting and physically active for so long BEFORE I got pregnant, that my docs said it was like my metabolism just "switched off". (oversimplification). So when I got pregnant, by body just essentially "turned on" the hunger and left it on. I eventually got used to it (and stuck to a very strict diet that quadrupled the calories I usually ate). My docs say they see the same thing in a LOT of pregnant anorexics. Also colossol weight gain. (I gained 20lbs a month eating 1800-2100 calories a day... <laughing> no that "one day I just ate and ate and ate" really was only 1 day. But my body was used to running 10mi a day, or hiking 20-30 on 400-600 calories). Upside, most of that colossal weight gain fell off almost immediately. 40lbs on day 1. 100 lbs the first year. Without dieting or exercising. When I was preggers, my body just clung to every single calorie it could get it's hands on.
Not saying you're anorexic or anything... just my story.