Chances of getting pregnant 9 weeks pp?

Had a baby 9 weeks ago, still haven’t had period. I’m exclusively breastfeeding but she does sleep through most of the night.

Had sex last night with a condom and he finished inside. When he pulled out he noticed that at some point the condom slipped off inside me. It was in there for a few mins while we tried to get it out.

We’ve no idea at what stage it slipped off or how. What’s the chances of pregnancy?

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