Moment of truth tomorrow

Two weeks ago, at 34 weeks, my little one was "measuring small." 4 lbs 6 oz is what they estimated. In the 13th percentile. They're going to measure him again tomorrow morning. My doctor told me that if he doesn't start gaining weight, he may have to take him early. I'm terrified. I know he'd likely be okay as I'm almost 37 weeks. Well, I will be in a few days. But 4lbs is so small. I hate complaining and worrying to my husband and friends. I don't want them to feel annoyed. But I really am stressed out. So worried about my little boy. Keep us in your prayers and in your thoughts. I'd very much appreciate it, ladies.