I’m loosing weight instead of gaining

Hi I am currently 21 weeks today. before I got pregnant I weighed 129 I now weight 122. I went to a wic appointment and the girl brought to my attention saying I’m loosing instead of gaining but when i go to my 4 week doc appointments they never tell me anything. They say everything is looking good. I went two weeks ago to a Place to find out my gender early and I was told the baby was looking good and a fast heart beat. I have an ultrasound appointment with my doctor on the 26 of this month. Is this normal?! Pls help!!! Keep me in your prayers !!!!