How to determine the father if the period came on October 30th

Patient's question:

I had my period on October 30th, with an average cycle of 28 days. The last three months, however, the cycles have been 27 days. On the afternoon of November 12th, I tested positive with a menopause test strip. On the afternoon of November 13th, I got a strong positive result again. On the afternoons of November 11th, 12th, and 13th, we had intercourse around 1:00 PM for three days in a row. We also had intercourse at 3:00 AM on the morning of November 16th. On the afternoon of November 21st, I had blood drawn to test my HCG level, which was 0.900, indicating I wasn’t pregnant. On the afternoon of November 24th, I tested weakly positive with an early pregnancy test strip, and I also had blood drawn to test my HCG level, which was 51.62. When will I give birth? Because the intercourse on the morning of November 16th was with my ex-husband, I want to know who the father of the child is. I really hope the doctor can provide me with professional clarification. Thank you!

Doctor's answer:

According to the situation you mentioned, based on your cycle, it seems you conceived around the 16th. Because if the fertilized egg implants, it can be detected as early as seven days later. This baby is likely your ex-husband's. On the 24th, you had blood hCG tested. This number is the value for early pregnancy at one week, and hCG can decrease seven days after implantation. You were normal on the 21st. This suggests that the fertilization occurred around the 16th.

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