Road trip in 7th month of pregnancy

Nu

I am going to be in my 7th month of pregnancy when my sister graduates from college. Problem is she is away at school in Iowa (a 4-6 hour drive one way) and graduation will of course be there. I have had a rough pregnancy with more than occasional near-fainting spells and awful sciatic nerve pain among other things- I don’t feel that it would be a good idea to go. My instinct is to stay home to forego the miserable ride and be close to my doc. What do u guys think? Should I go?