Jamie,
you are doing SO GREAT!! 2lb a week is NOT slow weight loss. There are many people on this forum who only lose 2lb a week in their wildest dreams, I was one of them.
You're right, all the things you mention can slow weight loss. Since I've been pregnant I've gained a whole new respect for hormones, man, the ways they can change your body is phenominal!
I'm so pleased your son is doing well and you have so much energy. I am 14 weeks preg tomorrow and am starting to get some energy back to do some walking and light weights, it feels GOOD! Now all I have to do is reign in the carbs a bit, I'm putting on a lb a week and it's a bit early for that kind of carry on yet. At least I'm keeping track of my measurements so I can tell if it starts to pack on anywhere besides the boobs and belly

Angela