Registering at hospital(s)?

My obgyn is located about 30 min from us and the hospital he wants me to register at is 45 min-1 hour away with traffic. We have a hospital 5 minutes from our house with a maternity center as well and I'm wondering if I should register there too just in case? 
Are you allowed to register at more that one hospital? What happens if I wind up for whatever reason at the one by my house, will they accept me as a maternity patient if I am not registered?