How many days after cohabitation can you know if you are pregnant?

Patient's question:

I got married last year. Recently, I've been experiencing lower abdominal pain, especially during my period. I'm very worried about it affecting my fertility, and I also feel extremely cold and fear the cold. How many days after intercourse can one know if they are pregnant?

Doctor's answer:

You can check blood HCG at the hospital one week later. The date of ovulation for women is generally about 14 days before the next menstrual period. After the egg is released from the ovary, it can survive in the fallopian tube for 1-2 days, waiting for fertilization; male sperm can maintain fertilizing ability in the female reproductive tract for 2-3 days, so sexual intercourse in the days before and after ovulation is easily fertile. For safety, we call the 5 days before ovulation, the 4 days after ovulation, and ovulation itself a total of 10 days the ovulation period. Because sexual intercourse during the ovulation period is easily fertile.

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