Weight gain 1st trimester!

Hey ladies, im 7 weeks today and stepped on the scale and I've gained 4 pounds already! I thought you weren't even supposed to gain weight in the 1st trimester. And no i haven't been scoffing down yummy foods the whole time. I never eat a full meal due to morning sickness. Im also not a first time mom so i know eating whatever you want is a big no go. Ive actually been eating a lot healthier and drinking tons of water! How on earth am i gaining weight already!? Im just freaking out because im already overweight and don't want to gain that much this pregnancy. Anyone else experience this?

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