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This may sound weird, but my extraordinary sense of smell can usually tell me. It's very subtle. This isn't the only thing, for sure, you'd be surprised what your nose can tell you if you pay close attention to it.
Other than that, girls have an uncanny ability to blatantly tell me. I guess I have that "tell me if you're on your period" aura to me...(?)
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Innominate.
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