You're totally normal!
I had pretty bad ankle swelling with the twins (starting at 25 weeks or so)...I worked a desk job, and by the end of the day my feet looked like giant's feet, my shoes and socks left marks, ugh! The first thing I did when I came home was lay down on the couch and put my feet up on some pillows.
This time (32 weeks) the swelling is just starting. If I wear tight socks, I notice marks.
If the marks go away after a few hours, and if you wake up with normal-looking feet, I wouldn't worry about pre-eclampsia. Swelling just happens to some pregnant women.
....just wait until after the baby is born and you LOSE all the fluid. For a while it feels like you're peeing out enough to fill a fish tank.)