Here are some logical reasoning about whether this child is normal or not?

Patient's question:

The first day of the last menstrual period was November 25, 2018; the menstrual cycle is 27 days; the menstrual period lasts 6-7 days; coital times were on December 6, 2018, December 7, 2018, December 8, 2018, December 12, 2018, December 16, 2018, and December 20, 2018, respectively; on December 25, 2018, a pregnancy test showed two lines; on December 29, 2018, a blood test detected hCG at 1400; on January 2, 2019, a blood test detected hCG at 2800; on January 5, 2019, a blood test detected hCG at 6100; on January 5, 2019, an ultrasound at the hospital showed the doctor estimated it to be around 36 days; 1, I want to know the specific day I got pregnant; 2, based on the above values and logical reasoning, how is this child normal? How can it be preserved? Thank you to all the doctors, you've worked hard!

Doctor's answer:

According to your description, based on the last menstrual period, you are currently 44 days pregnant. In clinical diagnosis, the estimated due date is also based on the last menstrual period. It is difficult to determine the exact day of conception. Your blood hCG level is normal, and further examination through an abdominal MRI is needed to confirm the location of the pregnancy and the child's development.
Advice: During pregnancy, maintain a regular schedule, pay attention to preventing colds, avoid spicy and irritating foods, strictly prohibit sexual activity for the first three months of pregnancy, and regularly undergo prenatal check-ups.
Wishing you a successful pregnancy!

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