i have pre eclampsia. Swelling of the face is classed as one of the warning signs of PE. To be classifed as having PE u need atleast 2 out of the 3 things.. swelling (oedema), High BP hypertension,protien in ur urine.
I would head down to the Emergency asap and just get them to check u out. they will take ur swelling of the face seriously. While you are there you can be expected to have your urine checked.. BP checked.. Bloods taken and mayb a CTG.

HTH