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I've recently started tracking my BBT every morning (only since the last day of AF this cycle). I knew the basics before I started, but yesterday I read that the temperature should be taken orally or vaginally. I've been using an underarm reading. For this cycle, I'm going to continue to take readings this way just to get used to looking for a pattern (I figured switching methods mid-cycle would just render all the data thus far useless), but have no issue with switching to oral next cycle.
I'm wondering how much of a difference the method makes, and if using an underarm reading could affect the accuracy of my chart.
I've only ever charted orally, so I'm not sure about underarm. However, you're right about consistency. Just keep using the underarm method for the rest of this cycle. Then switch to temping orally for the next cycle... if there is a next cycle.
Perhaps some other ladies have temped under their arm.
Yeah, I've already noticed that the readings seem a little strange. For one, my BBT is a lot lower than I've seen on other charts. Also, the temps seem to be decreasing (the lowest reading being today). I wish I would've started out orally!