Is your baby head down? Is he still flipping around?
I had polyhydramnios that developed between 26-29 weeks of pregnancy. My fluid levels were 26 on the day my water broke at almost 30 weeks. By some sort of miracle, my baby, who had been breech that morning at the ultrasound, was head down when my water broke. His head engaged and we did not have any trouble with the cord. I am a small person and at least for me, measuring 26 at 29 weeks felt huge. I was measuring 6 weeks ahead as a result of the fluid and the polyhydramnios is probably what was causing my preterm labor. After my water broke, I was able to stay pregnant for another 11 days and then I went into labor naturally at about 31 weeks. My placenta did abrupt partially near the end of labor, but my son was born less than 15 minutes later.
Normal levels of amniotic fluid are 10-25.
There are some risks with polyhydramnios. One of the main risks is preterm labor, but you are already far enough along! If your water breaks before labor starts, you probably want to be checked right away to make sure there aren't any problems with the cord. If the midwife or OB rupture your water during labor, they may want to do it in a controlled fashion to try to prevent cord prolapse or placental abruption. That said, these risks are uncommon.