Do you use OPK's track Bbt or both?

So I was lucky with my first baby and my husband and I guessed on when I was ovulating and we guessed right and I became pregnant first try.

We decided to ttc baby number 2 and I'm starting to track my cycle. I have been using opk's but should I also be tracking me bbt too? I assumed they both do the same thing, but I've read people using both.

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