Do I have the wrong mind set? Am I insane?

My SIL and I got into a little bit of and argument today. We were talking about sweets and how badly I crave them 24/7 but I only eat them maybe once a week because diabetes run in my husbands side of the family bad so he doesn't want me having to much sweets just to be safe. I don't argue because this is his child as much as it is mine and she told me I'm stupid for thinking that way. Then we started talking about working out which my husband is not okay with me working out besides light cardio. (I've had 6 miscarriages and 1 still born) I don't argue with him on that again because it's his child as well as mine. She told me that's insane that I'm letting him make those choices for me even though I don't feel stupid because I think I'm right about this, my husband is very worried and likes to be as safe as possible due to our history. So my question is how do I go about handling this? This was all through text I haven't responded to her last message with her telling me I'm completely insane for letting him make any choices during the pregnancy because it's my body. Am I wrong? Honestly...am I insane for letting my husband make these choices? I feel it's okay becAuse it's his child too.