Weight gain

Tahni
This is my 2nd pregnancy and I am 21+2 weeks. I gained so much weight (50 lbs) with my first by this time I had gained like 20 some odd pounds, with this pregnancy I have only gained 5 Pounds.... I actually lost weight in my first tri but it was cause I was stressed out. Baby's measuring fine I just think it's so weird how my body is reacting this time around.. Any one else?