@SkilledSailor - The monitor is an actual device that you use starting early in your cycle that measures estrogen and LH in order to give you low, high, and peak readings based on your baseline taken before FW. You'll just want to use the +/- OPK option if you are using wondfos. O generally happens 12-36 hours after your first +OPK and you'll need 3 elevated temps about your coverline to confirm O. Temping is a way to confirm O retroactively and to help predict when you will O in the future. By the time your temp has spiked on that first day, O has already happened.
Aug 18 March Siggy Contest