2nd baby=more weight gain?

As

I had my first baby at 19 and I walked out of the hospital at my pre pregnancy weight. I know I got extremely lucky with that but at the same time I lost almost all my muscle and skin color and health when I was pregnant bc I stayed so sick. but now I'm ttc baby #2 and Im scared my body will react the same way or complelty different. I didn't have to worry about gaining lots of weight with my daughter but I'm already gaining weight I can't get off and I'm not even pregnant yet will the next baby destroy my body? please don't judge me I know it's nothing to be ashamed of but I still want to feel good about myself