Last period on April 10th and due date is around January 17th. The calculation of due date is not accurate, but only provides an approximate date. The due date is calculated according to the last menstrual period by adding 9 or subtracting 3 to the month of the last menstrual period date and adding 7 to the number of days for the due date. Therefore, the due date for a woman whose last menstrual period was on April 10th is January 17th. The due date is a range used to remind pregnant women of the time of birth of the fetus. When you reach your due date you should prepare for labor, keep your mind open and wait for the fetus to arrive. If there are no signs of labor at 41 weeks, it is recommended that the pregnant woman should be hospitalized for observation or prepared for induction of labor. If there are any other questions, it is recommended to consult a medical professional for guidance.