Feeling so anxious

I’m almost 7 weeks with my second pregnancy. My daughter is turning 1 on December 27. I have my first appointment on December 29. I am feeling very anxious with this pregnancy. I am worried about having 2 children under age 2. I also am very bloated already and am very concerned about weight gain. Can anyone offer advice on making it work with 2 under 2? Also, what types of exercises is everyone doing?