32 weeks baby weights 3 pounds 8 oz and I'm so scared I had a recent ultrasound and I was told my…

32 weeks baby weights 3 pounds 8 oz and I'm so scared I had a recent ultrasound and I was told my baby abdominal hasn't grown like it should at 32 weeks trying not to stress but I'm a single mother and the father will not support me until I get a DNA which stresses me out more bc he knows what I'm going through and constantly brings up the DNA although everything is going on with my son health, did anyone else have these issues???