Goodness, if you're talking about the NMPG CNM group, I'd be running the other direction, personally. They have reputation of "finding" things that risk you out of using the tubs, and a high rate of intervention. If you must do a hospital, you really should check out West Suburban in Oak Park and West Sub Midwife group if you're interested in a water birth. Or even UIC/Rush if you have to stay in Chicago. But Prentice... I speak from personal experience with my 1st ds. My little warning voice was screaming at me to switch after the 36-week appt, and the head CNM calling me at work threatening me that they might have to drop me if I kept pursuing our "unreasonable expectations" (such as delayed cord cutting, no AROM, no residents -- all things that she had been telling us were fine up until that point). I will forever regret not switching. My dd's birth was an exceptionally healing UC and my 2nd ds is also being born at home, although this time with a mw. They've prettied Prentice up, but the policies in place are the same old out-of-date, non-evidence-based ones they've always fallen back on mainly to avoid [more] litigation than NMH already deals with.
It is never too late to switch. You don't get a do-over.