Patient's question:
I went to the hospital for a check-up because I hadn't had my period for two months and wasn't pregnant. After the doctor prescribed me some period-regulating medication, I got my period on August 11. On August 23 and 25, I went to the hospital for ovulation monitoring, but no follicles were found. The doctor then prescribed me some traditional Chinese medicine. On August 29, dark vaginal discharge appeared and lasted until September 1, when I started bleeding. However, on September 3, I didn't bleed again (it didn't seem like a typical period). Later, I didn't take any contraceptive measures, and on October 2, I went to the hospital for a check-up and found out I was pregnant. Could you please tell me what my last menstrual period should be considered as and what my due date is?Doctor's answer:
Hello: Your situation should start from September 1st! The average duration from ovulation and fertilization to fetal birth for women is 266 days. If you consistently measure your basal body temperature every day before pregnancy, you can determine the date of conception and thus calculate your estimated due date. However, for those who do not know the exact day of ovulation but only the date of their last menstrual period, we can estimate the due date based on that information.Traditional Calculation Methods:
Subtract 3 from the month of the last menstrual period or add 9 (calculate the date of the last menstrual period according to the Gregorian calendar; subtract 3 if the month is greater than 3; add 9 if the month is 3 or less), then add 7 to the day. For example: If the last menstrual period was on February 7, 1996, the calculation method is: month 2 + 9 = 11, day 7 + 7 = 14, so the estimated due date is November 14, 1996. If the last menstrual period was on June 17, 1996, the calculation method is: month 6 - 3 = 3, day 17 + 7 = 24, so the estimated due date is March 24, 1997. If the last menstrual period was recorded in the lunar calendar, convert it to the Gregorian calendar for calculation.
Calculating Based on the Onset of Early Pregnancy Symptoms:
This method is generally used when the pregnant woman cannot remember the date of her last menstrual period, or in cases of pregnancy during lactation or menopause. Generally, pregnancy symptoms appear around 6 weeks after menopause. At this time, the method for calculating the estimated due date is: the date of onset of early pregnancy symptoms plus 34 weeks, which is the estimated date of delivery.
Calculating Based on the Onset of Fetal Movement:
Generally, pregnant women can feel fetal movement around weeks 18-20 of pregnancy. Then, according to