BBT doesn't help?!?! *confused*

So...I've never ever bbt, and my one friend who struggled a year ttc just got pregnant. Her obgynea told her (before her bfp ) to throw away her thermometer, as tempting is a waste of time...

The reason he gave her was that you cannot go on the temp you have in the mornings, as one night you might be sleeping under just a blanket, next night it's warmer and you kick yourself open from underneath the blanket and then the temp cannot be the compared as your sleeping circumstances differ from night to night...?

Which makes sense more me, some nights are warmer than others, I have to get up sometimes at night for our toddler girl etc.

How do you bbt then?

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