Worried

So I haven't been gaining weight and it's freaking me out. I'm 31 weeks this week. And I went to my dr a couple weeks ago and was 217 then I went to Wic last week and was 214. I'm worried and have an appointment tomorrow. I just hope everything is ok. They've told me before that my baby is measuring small and to increase my protein intake. Which I have. Sorry just a little bit worried.