Can you use regular thermometer for BBT?

L • 26, due with 🌈👶🏻 August 7th

I had been using a regular thermometer because I couldn’t find bbt thermometers in stores. I ordered one that came in yesterday. My asshole cat knocked it off the table and I can’t find it anywhere. I looked under our oven, under the fridge, in every crevice it could have been pushed into. Can’t find it. Can I continue using a regular thermometer?

If not give me a valid reason and not just opinion based. I want facts.

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