Okay, so I should probably just wait until tomorrow to see if my temps stay up, but I'm going a little psycho here.

I just started using OPKs this cycle, both first thing in the morning and early afternoon (around 2:30pm). They've been completely negative since CD11 when I started using them. Monday morning I got a light second line (still negative, according to the packaging), and Tuesday morning my temps shot way up. They're still up as of this morning, but judging by my usual cycles, I'm not due to O until Thursday or Friday.
What's your experience with OPKs? Is it possible that my slight line was actually a positive? I've been testing 2x/3x per day, and I've never had a line any darker (or ever again).
Help!