What is the possibility of getting pregnant having intercourse the day I start my period?

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I had sex with my husband (believe it or not) COMPLETED IT for the firs time saturday. I started my period later that night. Could I have gotten pregnant?

Pretty slim but always possible.
I believe it’s not likely because that period means you’re not pregnant. But I have heard people say they had a period after getting pregnant, so you could be an unusual case.