Aww, what a cute little bean!
My midwife replaces a regular OB. She works with a practice of four midwives (I actually cycle through all of them and deliver with whoever's on call, but I've only met one so far). Unless I go high risk for some reason, I stick with the midwives, deliver with the midwives, and don't see an OB at all beyond a consultation with the OB they partner with for legal reasons. If anything happens at the birth that requires an OB, like having to have a c-section, their partner OB takes over the actual birth but the midwife stays around for support. I think I could, potentially, see an OB and a midwife if I needed more complex care but also like the personal touch of a midwife, but I'm really not sure. I usually hear about people seeing either an OB or a midwife, not both.