With my first pregnancy I walked and biked constantly. I'm pretty sure that is what enabled me to have a fast and natural labor and delivery. My whole labor was like 10 minutes less than 3 hours with only 3-4 pushes. Good luck. :)
Yes its ok. I walked 4-6 miles daily while pregnant x
Of course if anything i think it gives you a health advantage over other mum to be who drive everywhere.
I walked everywhere with my first pregnancy and i was healthy and my pregnancy went incredibly smoothly.
Happy walking.x