with my last son I had to drive 2.5 hours out of town for work every 3 days, I did this all the way up till the week he was born and everything was fine with him and everything else with my pregnancy. But make sure if you feel the need to get out of the car that you do so.
It's recommended if you travel to take the time to stop and walk around for 15 min, every two hours but since your trip is two hours you should be fine.