Small baby

Elizabeth • 👧🏼👦🏼👼🏼 TTC #4
So my doctor is measuring about 2 weeks behind and she is on the smaller scale. I saw my doctor today and we talked about worst case scenario (if they feel she isn't getting the right amount of nutrition). She said if that's the case then around 32 weeks they will have me deliver. I know it's worse case but I'm scared and nervous and just overall worried. 
I also have celiac and I'm tiny to begin with (about 98 pounds pre pregnancy). She said that could be part of it.