so my whole life

I have been 95-115 pounds and no one has ever really called me fat... I've been told I need to gain more weight plenty of times.. I've never really been okay with people talking about my weight though because my mom my whole life weighed over 300 pounds.. i always told myself I would never get to be that.. never would I weigh more then 150.. well right before I got pregnant I weighed 115, and I'm 27 weeks now. Two weeks ago I weighed 127 and in the past two weeks I've been hearing I'm getting to fat, and I'm gaining to much weight. So I'm literally scared to get on a scale to see how much I weigh now... my doctor told me I need to eat every three hours because of the baby, and I've been trying to do that... but I've been craving like crazy Steak 'n Shake cheeseburgers.. two nights ago I gave in and ate one. I ate the cheeseburger then 3 hours later I started craving hot dogs so I ate two of those... I told someone (my mom) about it and she told I need to watch it because if I gain more then 30 pounds I won't be able to lose it... then I walked into work the next day and my boss took one look at me and said " you are getting fat".. I know she probably didn't mean it but it still hurt.. so I put aside an hour to excerise, and I've been trying to eat healthier by eating carrots, bananas, strawberries, and apples.. and now people are telling me I need to start watching my salt intake.. and it doesn't seem like anyone's happy... what I'm scared of most is how my husband will see me after I give birth.. I will never have the body I had before I gave birth every again.. and that's something he fell in love with.. we have talked about it and he said he doesn't care how I look afterwards because it just shows I carried another part of our love for 9 months.. so I guess what I'm really looking for is words of encouragement... I am currently dying for a Steak 'n Shake cheeseburger but instead I'm going to go in my fridge and cook me something healthy...