Should I also take my temp if I'm already using opk?

I've been TTC for about 10months, I'm <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> using the opk and I get a surge every month. Someone told me to take the temp too. I don't feel it's necessary. What do you guys think? 

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