condom slipped off

Pr
So my bf and I had sex, it was great. Only problem is at some point the condom slipped off after he came... then he pulled out and realized the condom was still inside me. So he pulled it out and we couldn't figure out what was his cum, versus my cm. What do you think? (Has this happened to you?) he's going to get a Plan B in the morning. 
(Glow says I'm at a 7.8% chance of pregnancy. My fertile window is two days away.) 

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