Breathing concerns in a baby I'd definitely call an ambulance.

A week ago my 3yr old sustained a head injury from a fall. I drove her straight to the bigger hospital 50kms away. I was not calling an ambulance for them to transfer her to our local hospital only for them to decide she needed to be at the bigger hospital and waste hours waiting for a transfer. We walked straight in and was triaged and sent straight to trauma. It would be the same for any pregnancy complications. Or I'd drive or be driven to a destination where I could be sure they would take me to the bigger centre.