I think I ovulated on Monday instead of Sunday. I know I got the OPK positive on Saturday, and thought for sure I would O on Sunday, but my temp on Monday morning is not accurate. I did not get a good nights sleep, woke up every hour, and my temp was taken at 4:45 a.m. instead of my usual 5:30 - 5:45 a.m. temp time. The biggest thing is Monday evening after my softball game, I came home and discovered a bit of spotting on my undies, which has NEVER happened before. I've read that some women do have ovulation spotting,though it's rare, but maybe that's what it was? I don't know for sure, but I feel pretty confident that my O date is actually Monday.