When did you stop traveling when pregnant?

Moms-- 
This pregnancy thing is all new to me. When did you stop traveling when pregnant? Like, a 5 hour road trip. Is that okay to do 8 1/2 months pregnant? 
Edit: adding the story. It's my sister's bridal shower, and I'll be 34 weeks pregnant then. I'm just playing it by ear, but wanted everyone's feedback! My mom keeps making me feel like I'm silly for worrying about driving that far. 

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