Awe, I'm sorry you are worried. I had the same issue with my first baby. I kept losing weight due to my nausea, but once I finally gained control of it, I gained my weight and the baby was growing more. I also changed my prenatal vitamins from store bought to prescription. I still ended up having a c-section early due to high fluid levels. He was tiny, but now he is 13months in the 95percentile. I just put my trust in God and the doctor, bc the stress was not helping me or baby. Try to relax and everything will work out:-)