My poop gets liquid on Atkins diet? ?

Ok, it's a little disgusting, but I have to ask. I've been on the Atkins diet for one week and one day now. I'm really liking it, already lost 6 lbs and I have so much energy. The only problem I have is that I have to poop almost after every meal, my stomach is really upset. And when I poop it's all watery, kinda like diarrhea. My stomach gets like that after a night of drinking, too. Is this normal?! Thanks.