Patient's question:
Last menstrual period was June 1st, the date of the previous menstrual period is unclear.1. July 24th examination results: Uterus: in the normal position (5.8+2.6)7.44.9CM, well-shaped, enlarged, with 2.4 embryos visible in the uterine cavity, surrounded by a "double ring" sign. Diagnosis: Sonographic changes of intrauterine early pregnancy, approximately 9W+3.
2. September 26th examination results: Biparietal diameter 4.0CM, chest diameter 3.3CM, abdominal diameter 3.8CM, femur length 2.2CM, fetal heart rate: 157 beats/min, placental thickness 2.1CM, amniotic fluid dark area 3.3CM. Diagnosis: Mid-pregnancy.
Doctor's answer:
Based on the first day of the last menstrual period, the estimated due date is calculated. The entire pregnancy lasts for 280 days, which is equivalent to 10 gestational months (each gestational month being 28 days). If a pregnant woman delivers between weeks 38 and 42, it is considered full-term. Since the menstrual cycle length varies among women, it is normal for the estimated due date to differ from the actual due date by 1-2 weeks.