Just started temping this month as cycles unpredictable after coming off the pill and I had read how accurate this method is. I'm doing it orally as soon as I've been waking up, never bothered this morning though as something clearly isn't right here. I could do it first thing, then do it again a few mins later and the temp will be totally different. What's going on?! Graph attached as well as pic to show what one I'm using. Reluctant to do it vaginally.