I'm pregnant and having my first child... ?

With my husband of 3 years. I'm petite like 4"11 like 95 lbs. I am currently 19 weeks and I am showing a little but I've had family that have made remarks about my baby is going to be small and have a big head because my husband does. It sometimes hurts my feelings but I dont say anything. I know I'm going through a lot of emotions now. But I wish my folks would help me feel better about my pregnancy. I'm already paranoid enough worrying about my baby. What should I do?