Just curious 🤔

So I was recently in the hospital and they did an ultrasound on me. They said my baby girl is small for how many weeks she is. I was in there in there when I was at the end of 26 weeks and also when I hit 27 weeks. They said at 27 weeks she is 1 lb and 13 oz. Has anyone else had a doctor tell you that your baby is under weight ? It has made me sad but my man made me feel a whole lot better when he told me I just need to have faith and remain positive. I go and see my OBGYN on the 2nd. Has anyone else experienced it ? Or have any advice on how to get her weight up ?