If the app says chance of pregnancy is 27% does that mean if I have sex today I have that chance?

pregnancy is 27% does that mean if I have sex today I have that chance?" />

I'm confused, because if I have sex today, sperm lives inside you for 7 days, so tommorow when it's 30% chance, does that mean if I have sex today & not tommorow, that I still have 30% chance of getting pregnant

I'm confused how this works?

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