Ask questions. About everything. Literally everything. “what are you doing? why are you doing that? What other options do I have? Are there any risks with doing that? What else can you do instead?” Ask questions about where you birth, when and with whom. Ask what the evidence is and if there is any contradicting it. Learn about levels of evidence and recommendations in pregnancy. Know your hospital's policies on induction, monitoring, appointments, home visits, breastfeeding and bottle-feeding, support people, bed sharing, everything. Read every one. And learn the difference between policy and evidence.
In other areas of health, we might have the opportunity or feel secure in asking for second opinions, researching other options or just saying no. When we are having a baby however, quite often our default position is to give our decision making and reasoning over to the "experts". After all we don't want to make the wrong choice... and what do we know?