weight gain in early pregnancy

Hey y'all! I'm kind of freaking out. I'm only 5wks and 3 days and I've gained 7 pounds since I've found out. I'm already overweight so I've been trying very hard to watch my intake of carbs/calories/sodium and I've cut out all pop. I feel like such a failure already. I don't know where this weight has come from?? Especially since I'm eating healthier and making sure to drink 8-10 glasses of water every day. Has anyone else experienced this? I have been bloated/constipated but I know it's not 7 pounds worth!