Uterus measuring small

Okay lets start this off with a little back ground story.. so ever since my last year of middle school I had anorexia. As time move on and my dad found out I went thru many failed attempts at recovering. well after me and my fiancé got together I wanted a baby so I started working on my health and getting to a healthy weight and taking vitamins to get my body ready and I got pregnant. it's been hard trying to cope with the fact I just can't stop eating, and also that I'm supposed to gain 30 pounds when before if I gained 5 I wanted to kill myself... it's hard. Some days I will find myself only eating once or low calorie things without realizing what I'm doing.. well now My uterus is measuring small and I just cant help to blame myself.. I feel like I failed as a mother cause I can't give my baby the nutrition it needs cause I'm too worried about how big I'm going to get and how hard it's going to be to lose the weight... idk I think I just needed to rant 😞