Spotting, no cramps ******

Gi

I'm 13 DPO today. My BBT was trending down lately but went back up today. I wiped this morning and it was light pink spotting. 3 hrs later, it was redder spotting. 2 hrs later, it was brown spotting. I don't want to waste a test. I have no other symptoms. What do you think is going on?? (I got pregnant last year on the first try. And this cycle, we did it 4 times in my fertile period, so I SHOULD be pregnant!)😢

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