1. What is ten months of pregnancy? Ten months of pregnancy refers to the situation in which a pregnant woman has not given birth after the expected date of delivery and continues to be pregnant. Generally speaking, the normal pregnancy period is 40 weeks, which is about 280 days. However, in a few cases, a pregnant woman may exceed her due date, causing the pregnancy to extend to 10 months. 2. Why does it happen that I am ten months pregnant? 1. Error in calculating the expected date of delivery: Some pregnant women are not sure about the time of their last menstrual period or the date of ovulation, resulting in errors in calculating the expected date of delivery.