What is the approximate date of conception?

Patient's question:

Last month, my period was on the 18th, with a cycle length of 32 to 36 days. On November 21, I took a blood test and found I was pregnant, with HCG at 648. My husband and I had intercourse on November 1, 3, 4, 6, and 12, but we made a mistake on the 14th by having sex with my ex-boyfriend. Subsequently, on the 21st, I tested positive for pregnancy and started worrying if it might have been from that day. Was it a safe period or ovulation day? Today, I had an ultrasound, and the results showed an intrauterine pregnancy with a gestational sac size of 1.61.6.

Doctor's answer:

Hello, in this case, the days 7 days before and 8 days after the menstrual period are generally considered the safe period. Excluding the menstrual period, the other times are considered the safe period. Therefore, the 14th is likely within the safe period, and the possibility of pregnancy is low. It is considered that pregnancy may have occurred around early November. It is recommended to pay attention to dietary nutrition and rest.
Generally, doctors advise women with signs of potential genetic risks to maintain a balanced diet and avoid spicy, stimulating, and cold foods. Additionally, patients should also pay attention to a comfortable environment, which is beneficial for rest. Wishing the patient a healthy delivery.

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