Is it normal to have edema in legs 5 weeks post-op Smart Lipo?

I had smart lipo 5 weeks ago. Had abdomen, flanks, inner and outer thighs, banana roll and knees. My swelling had gone down quite a bit. My stomach was looking flatter. Two days ago I traveled home for the holidays which was a 4 hour drive. I woke up this morning with pitted edema in my legs. I wear compression 23 hrs day and have been wearing compression socks on and off. Is this normal? Should I be worried? I was on my feet more yesterday and had more sodium than usual.