I found a form on my hospital's website where I could request my notes. Had to pay a fee (think it was about $35 from memory) and I could choose if I just wanted a copy of the notes or if I wanted a debrief. Once I paid the fee it only took a day or two and I could collect the notes from the hospital. I'm not sure what your OB was like but mine only turned up for the last 30 minutes so if you only get their notes you might miss out on everything the midwives recorded.

Good luck xx