Grade 3 Placenta

Hey girls. I was just told after my sonogram (I'm 37 weeks) that I have a grade 3 placenta. Baby is almost 7 lbs so up until now it's obviously been very well nourished. They have me scheduled for weekly NST until I deliver. My question is, has anyone else had this? How quickly did you go into labor and did they induce or was it natural? I've had 2 normal pregnancies so I'm in unfamiliar ground here. I'm upset at the idea of baby staying in cooking and being in a bad situation when I could deliver and have everything be healthier with it out. Help!