Anyone being monitored for fetal growth?

I have searched on here but I have not found someone in my situation. I started this pregnancy with being high risk and having to go to my OB every 2 weeks for cervix checks after having a leep 1.5 years ago. During a cervix check when I was 15 weeks the OB saw that part of my placenta was not fully attached to the uterus. This will cause growth restrictions and I was informed that if/when the fetal growth falls under the 10% I will have to deliver. I go in for my 20 week appointment (now with a specialist) tomorrow and I'm very nervous. I don't know what to expect. Anyone had this occure and know what I should expect tomorrow or just in general for the rest of the pregnancy. I have asked questions at every appointment I've had since then but i am told they cannot give any answers until my 20 week appointment (when they do an extensive anatomy scan) to determine the severity of everything.