Road trip, very nervous 😳

I'm not quite sure what group to post this in, but I picked this one. I have a trip planned to drive down to my grandmother's in about a month and a half. My dad will be flying in from Texas, and that portion of my family still hasn't met our 9 month old son, so it's definitely happening. When this trip happens my son will be 10 months old and I will be 27-28 weeks pregnant, and I am SCARED, because my husband won't be able to take the time off, so it will just be me alone, and it's about a 8-9 hour drive and we will be there for about 6 days. Anyone have any tips for me?! I'm feeling very overwhelmed about it and would love some reassurance 😥