Is it possible to get pregnant three days after cohabitation?

Patient's question:

Detailed medical condition and consultation purpose: My last menstrual period was on October 10. However, I and my partner had unprotected sex on November 7, and since then, my period has not arrived. We are worried that we might be pregnant. Today (November 19), while using the restroom, I had blood like a menstrual period. Is this my period? If so, shouldn't it be possible to get pregnant within three days after unprotected sex? If not, what is the situation with this blood? Is it normal? Thank you for the doctor's answer!
Medical history: Had an induced abortion on September 8.

Doctor's answer:

Hello, if pregnancy occurs after cohabitation, it is generally possible to detect it through a blood test about one week after cohabitation. A pregnancy test kit can detect it between 10 to 14 days after cohabitation. Since you have just cohabited for 3 days, there are no reactions yet.
Advice: I recommend that you continue to wait. If your menstrual cycle does not arrive, you can use a pregnancy test kit to test. I hope you can evaluate my response.

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