Patient's question:
August 28th, the ultrasound showed 7 weeks. Could you tell me when I might have conceived? I can't remember the last menstrual period.Doctor's answer:
Generally speaking, pregnancy lasts for 280 days. In medicine, 28 days are considered one obstetric month. Pregnancy at 40 weeks is equivalent to ten obstetric months (hence also known as "ten months of carrying a child").Calculating the estimated due date starts from the first day of the woman's last menstrual period. Add nine months or subtract three months from the month number, and add seven days to the date number. If the expectant mother adds 15 days, it becomes the estimated due date according to the lunar calendar.
The calculation of the estimated due date is only an approximate estimate. Based on the actual condition of the mother, it may vary by about seven days before or after. If the menstrual cycle is usually short, less than a month, the delivery date is likely to be before the estimated due date. If the menstrual cycle is usually long, around 40 days, the delivery date is likely to be after the estimated due date.