Hi Caroline,
I love my OB/GYN! His name is Dr. Gregory Chen and he is a part of the group Progressive Care for Women, located at 676 N. St. Claire. There are 4 doctors at the practice, the 3 others are women and all wonderful as well. As part of your prenatal care, you rotate so that you get to know all of the doctors in the event there is an after-hours emergency - this way, you'll be familiar with whichever doctor is on call.
My first child was delivered by Dr. Chen in 2006 and I am currently seeing him for prenatal care with my 2nd child. He was ranked as one of the top OB/GYNs in the country and is also a professor at Northwestern Medical School. Not only is my doctor great, but the office runs like clockwork. I have never had to wait more than 15 minutes for my appointment. Most of the time, they're calling my name before I've even finished peeing in the cup! Also, they have an in-house lab, so if you get your blood tests before 9:30 you'll get your results the same day. They also have an in-house ultrasound tech. They can take care of all your needs easily without sending you outside.
The group is affiliated with Northwestern and does take Aetna (this is the same insurance that we have). I would highly suggest checking them out! I know they have a website - google them and it should come up.
Hope this helps! Feel free to contact me if you have any other questions. And congrats on the baby news!