Temp spike at same time as OPK+?

I'm confused. I had a smallish spike in my temp this morning which I was going to attribute to getting the flu shot last night, but this morning I had two OPK (a clear blue advance digital and an Internet cheapie) turn positive very quick. I tested with the cheapie at 9pm last night and it was negative, and at 7am was positive. The clear blue skipped any "high" flashing smiley and went right to solid smiley "peak". I had expected that the OPK would be positive and the temp spike would come a day or two later... Do you think the temp is just a fluke (or from the flu shot)? Also, do I stop all OPK testing now that I got a positive? Or keep going til the test turns negative? Help!