Bad swelling while travelling ... help.pls

I am 27weeks and 3 days. I recently went for a short holiday and we drove down for 5 hours. I had this elephant feet which looked terrible. As soon as I reach my destination I took rest and elevated my feet and swelling reduced. Again while returning back home I have this terrible swelling. I think it's because of travelling but I need assurance is it normal or should I see my doctor ??? Pls help