Trying not to gain weight - need advice!

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I’m 6-7 weeks in and if I don’t eat every two hours I feel like I want to vomit and start gagging. Any advice? I end up eating MEALS for each session but I know the baby doesn’t need food from me at this early in the stage - any advice is welcome. I gained 50 lbs with my last and I’m already 20 lbs heavier then I was my first pregnancy to start. I don’t want to feel

Miserable by the end! Thanks!!!