Differences in pregnancies

My two pregnancies have been polar opposites.

With my first baby/son I gained nearly 50 lbs by the time I gave birth. Always hungry, no unbearable aches and pains besides some heartburn, even went 2 weeks overdue before being induced.

Now I'm 37 weeks along with my daughter and 140 lbs. I've only gained 20 so far! Constantly have hip/pelvic pain, back hurts, nauseous, can't eat most things, basically just miserable.

It's crazy how different pregnancies can be!

What's your experience with this?