Little weight gain

I am 36 weeks as of today and I have only gained 2.6 lbs my entire pregnancy.. I started my pregnancy overweight and have been throwing up my entire pregnancy. I have been measuring 2 weeks ahead at my last 2 appointments.. people are just freaking me out asking questions and making comments about how awful that is and hopefully the baby is developing normally and ok... my doctor hasn’t expressed any concern in this department but people and their comments are freaking me out that my baby isn’t developing normally.. i need some confidence boosting that my little lady is healthy! This is her 3D at 30 weeks and I thought she looked perfect with sweet little cheeks!