Patient's question:
I have always had irregular periods, and I haven't had my period for two months. So, I used a pregnancy test and it came back positive. I went to the hospital for an ultrasound, which confirmed early pregnancy. The ultrasound indicated 5 weeks of gestation. Since I don't know the exact day I conceived or how to calculate the due date, I'm unsure if the ultrasound is accurate.What kind of help do I need: How to calculate the due date?
Doctor's answer:
Analysis of the condition: The calculation of the estimated due date is based on the entire gestation period of 280 days. The specific method is as follows: Due date month = First day of the last menstrual period (LMP) month + 9 or -3, Due date day = First day of the last menstrual period (LMP) day + 7. The calculated date is the estimated due date. If the last menstrual period was on February 1, then February + 9 = November, and 1 + 7 = 8, so the estimated due date would be November 8. If the last menstrual period was after April, the method of subtracting 3 is used. For example, if the last menstrual period occurred on April 2, then April - 3 = January of the following year, and 2 + 7 = 9, making the estimated due date January 9 of the following year.