Baby measuring small ☹️

I'm 35 weeks and 5 days. And I went to a ultrasound appintoment and they said my baby was measuring small so I had to go to a non stress test. Well moral of the story they did the test baby's heart rate was pretty good but my baby is only weighing 4 pounds    5 oz. which is in the 10th percentile which isn't good.....the doctor didn't give me too much in depth information but basically there going to keep monitoring me every week until I'm 37 weeks. (Full term) and if the baby doesn't progress or get bigger then I might have her early. I'm just nervous and scared because I hope she can put on some weight. :/ any other moms going through this ? I'm due September 11th.