I hate that too. Everyones like "eat! You're eating for two!" -.-
My mom was pregnant at 15 and moved in with my dad and his family. They never invited her to eat with them. My grandma only invited my dad.
My mom felt lonely and not cared for. She basically only got leftovers after everyone was done.
You should be thankful you have people that care enough to feed you and your baby.
Although, I understand how you feel about not feeling comfortable.
Just take it as a blessing that you have somewhere too stay and good to eat.