BBT- post ovulation question

Hello. Does your bbt need to stay extremely high, or keep rising if you are pregnant? You can see (click on pic and you can see more of the chat) I'm on 13 dpo, and while it has stayed high, it isn't jumping up really quickly. Tested this morning and still no positive, and a few light brown spots the last two days, but nothing else. Any insight would be great!

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