Road trip 34 weeks pregnant

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So my BIL wedding is a destination wedding and its going to be a 14 hour drive there with a 13 month old as well as being 34 weeks along. My OH and I have not announced the pregnancy yet as I'm 11 weeks but we had to put our deposit on our room down and the car rental and I'm super nervous to be traveling that late. Any tips for the trip? We will be traveling at night to make it easier on our son to hopefully sleep through it and I'm going to wear my compression stockings and make extra stops to get out but other than that is there anything else I can do to make it easier? Also its a week away from home on an island which makes me even more nervous if something happens I will need to ferry across to the mainland then travel to the hospital. Its freaking me out but its an important day and we said we would go, they announced when I was 4 weeks.