I am new to BBT charting, and have been doing it in coordination with OPKs. I thought that when there was a drastic temp drop, that meant ovulation (when you were looking at it over a span of multiple days). Well I had a drastic drop in temp on Oct. 2nd and 5th but all of my OPKs were negative on those days. I got a positive OPK today, but my temp has risen today... I thought a rise meant that you already ovulated?? Am I misunderstanding how BBT works? There was certainly no denying my smiley face this morning, so I know I definitely ovulated. Sheesh. I'm such a newbie. 😣