Should I listen to my mom?

Sky

So I'm a FTM and 18 as well, my mom has 4 kids so she gives me a lot of her input. Well now her newest input is that I eat too much sugar and carbs and says I'm going to have a big baby even though my doctor says I'm doing perfectly fine. Both her and my dad brush off that the doctor says I'm doing fine and say that they live with me and see how I eat. I know I don't eat the best but I've been walking a lot to make up for it. Now I'm having really bad hip pain to the point I can't walk and all my mom says is walk more. Honestly I feel really unsupported by them and I was wondering if I should listen to my mom or not. Thanks