When's to late to drive on a vacation? ??

Holly • I`m holly. I`m 23 years old, and have been married to my hubby for 5 years. We have a beautiful daughter who`s now 2. We are currently trying for baby #2, we`ve been trying since November.
My husband is really wanting to go to Florida before the baby comes with his family. I'm a little nervous with it being such a long drive.. we live in Indiana so it would be like 14 or so hours.. and the week they are planning on going in would be 34 weeks going into my 35th week. Have any of you other mommas traveled that long and everything was ok?? I just don't want to go into labor while driving haha #worriedmomma