Ugh, OP....I am also worried about the same thing. I'm not even 5wks preggo yet, and I'm already hungry ALL THE TIME. (Up at this awful hour because I'm starving.) I'm trying to make good choices with my food, but already the scale has gone up. Nothing scary, but I can't gain weight at this rate the whole time or I'll be the size of a house!
I'm really kicking myself for adopting a "meh, I'm pregnant - I can eat anything!" attitude during the 3rd trimester and eating all those high caloric (but still organic :roll

foods. I gained about 35 pounds, and then my in-laws just keep bringing sweets into the house after the baby was born and I put on an additional 10 pounds after that. (And also medical issues with my baby, so constantly on the run to doctor's appointments, which meant crappy on-the-go food choices for me and DH.)
I'm 20 pounds above my pre-pregnancy weight, but I'm 5'3", so that's a pretty hefty amount. REALLY trying to limit my weight gain to 15 pounds this pregnancy.