How to determine the time of conception

Patient's question:

Doctor, I would like to confirm my delivery date. My last menstrual period was on June 10th, and it ended on the 15th. On the 16th, I went home and had an accident where I was forced by someone to confirm that I hadn't been ejaculated. After the 20th, I have been with my boyfriend and haven't taken any contraceptive measures, as we always wanted a child. On July 25th, I went to the hospital for a thorough check-up and found out I was seven weeks pregnant. I'm afraid to tell my boyfriend about what happened again. I really want this child, but I'm worried it might be someone else's. Can you help me?

Doctor's answer:

I'm glad to help clarify this for you. Based on your description, if your menstrual cycle is regular, occurring every 28-30 days, the time of menopause is 14 days before the next menstrual period. Therefore, your ovulation period would be around days 24-26, and if you have been with your boyfriend since the 20th, your delivery time should be around those days. This is an estimation based on your menstrual cycle. If you want to confirm it, you would need to undergo an amniotic fluid test to measure DNA.

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