Patient's question:
Doctor, my last menstrual period ended in mid-July, and I had no sexual activity in between. On August 4th, I had intercourse with my husband. It has been 82 days since then, which is 11 weeks and 5 days. However, today's ultrasound results show the fetus's biparietal diameter is 27.7mm, head circumference is 96.9mm, abdominal circumference is 81.3mm, the spine is visible, the fetal heart rate is 160 beats per minute, and the maximum depth of amniotic fluid is 35.7mm. According to these data, is the fetus larger than expected? The doctor said that based on these measurements, the baby should be around 13 weeks, but it doesn't match the date of intercourse.Doctor's answer:
If your menstrual cycle is regular, with a cycle of about 28 days, the gestational age is calculated from the first day of your last menstrual period, not from the date of delivery. Therefore, based on the assumption that you had intercourse on the same day, your last menstrual period should be around July 20th. The above is the suggestion for the question "Doctor, my last menstrual period ended in mid-July, when did I conceive the child?" I hope it helps you. Wish you health!