Baby's stomach measuring small

I have been seeing an MFM specialist for several months because of a sub chorionic hemorrhage and a velamentous cord insertion. Well my baby has been measuring a little behind but at this past appointment almost every organ,brain, bones, etc have been right on track if not ahead (on her brain) except for her stomach. I was already told previously that I'd need a csection at 37 weeks so I didn't go into labor but now the MFM said that I may have to have one even earlier. I'm a bit worried. Has anyone else been told their baby's stomach is small? I'm wondering how she would do if they took her even earlier and how early will they take her? Any advice or experience would be helpful! I'm 28 weeks 4 days.