Eating and weight gain

So, before I got pregnant I only ate once a day, but I drank a lot of soda. Unhealthy I know. I am a bit overweight. I'm 5'2 and 160 pounds at first prenatal appointment. Since, I've been pregnant I've cut down on soda working to stop drinking it all together. But I have been SO hungry. I have to eat breakfast and lunch where before I only are dinner. Is this normal or will I gain unnecessary weight?

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