worried mama

just feeling a little down . I am 35 weeks and 3 days . Two weeks ago I was 142 today I weighed 138 meaning I lost four pounds . On top of the fact I got my growth ultrasound and my doctor said the baby was right over 4 pounds in the 15% tile which is a little low and in two weeks they want to do a follow up ultrasound to see if it's normal and he just is going to be small or if he may not be receiving all the nutrients through the placenta where they may have to take him early. I am due Jan 22. I also need to pick my appetite up as well . My last day of work is Saturday. I plan on resting and stuffing my face lol