How likely could I be pregnant?

*I'm going to start off by saying I have a 27% chance of becoming pregnant today. I'm ovolating. *
My boyfriend and I had unprotected sex. He felt a sensation in his penis & said he might have precummed. He says he don't precum every time he feels it, but it can happen. He didn't act worried at all so I'm assuming I'm fine. 
Also, we're both adults so whatever the outcome may be, would be fine.

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