Stucki- Don't take offense if I don't eat any canned jam you might send to me for Christmas
Cutler - I think you have to assume there is a margin of error in OPK tests... that last test is definitely positive, but depending on the time of the day you're taking it you might be ovulating at that very minute and (if the surge started earlier in tje day and your just now testing) or it could be in a day or so. The opks will give you a 2-3 day window and the temping will narrow it down to one day based on your bbt. The more factors you take into consideration (bbt, opk, cp, cm) the more accurate the chart will be. Not to mention that they are next to impossible to interperate sometimes!