I'll second (fourth? fifth?) the advice on this. Without trying to imply that you're in the same boat and totally freak you out, I got severe PE and HELLP at 24 weeks after a totally uneventful early pregnancy the first time around. Once they'd noted my high BP and protein spillage and diagnosed me with mild PE, the only thing that signaled the shift from mild PE to severe-PE-with-Stage-IV-HELLP (i.e., BAD, must deliver NOW, in less than a week from initial diagnosis), was a nasty headache that wouldn't go away and just kept getting worse.
With luck, you've just got a nasty headache. But let your doctor make that call—better safe than sorry.
Pre-eclampsia and Stage IV HELLP, c-section at 25.6 weeks. RIP Felix (July 25-Sep 27 2011).
Expecting #2 in early March 2013. So far, so good!