Thank you for your query.
You have two concerns:
1. Weight gain following gall bladder
2. Doubt about future pregnancy
Weight gain has nothing to do with gall bladder removal. You need to have a balance between your calorie intake and your exercise which is going to determine your weight gain or weight loss
or maintain the same weight.
You can certainly plan to have another pregnancy. This surgery is not going to prevent further pregnancies.
I hope I have answered your query to your satisfaction.
Wishing you all the best.
Rajiv K Khandelwal