What is the due date if the last menstrual period was May 18?
Oct 13, 2022
Source: Cainiu Health
Dr. Lv Aiming
Introduction
With regular menstrual cycles, if the last menstrual period was on May 18, the due date would be around February 25. However, for patients with irregular menstrual cycles, the due date may be appropriately adjusted earlier or later. If you notice that your period has been absent for over a month, you should promptly visit a hospital for examination to confirm whether you are pregnant and make appropriate adjustments based on the results.
When menstrual cycles are regular, if the last menstrual period was on May 18, the due date would be around February 25. However, for patients with irregular menstrual cycles, the due date may be appropriately advanced or delayed. If a woman notices that her period has been absent for over a month, she should promptly visit a hospital to check whether she is pregnant.
Pregnancy is calculated from the first day of the last menstrual period and typically lasts about 40 weeks. For patients with regular menstrual cycles, the due date is calculated from the first day of the last menstrual period—May 18 in this case—resulting in an estimated due date around February 25. If a patient finds that her period has been absent for more than a month, she should promptly go to the hospital to confirm pregnancy.
For patients with shorter menstrual cycles, the duration of pregnancy may be correspondingly shorter, so the due date might also be earlier. It is recommended that patients seek timely and regular medical check-ups after confirming pregnancy to prepare properly for delivery. Conversely, for patients with longer menstrual cycles, the pregnancy duration may be longer, and thus the due date could be delayed. Therefore, it is advised that patients maintain a positive mindset as the due date approaches and attend regular hospital visits for monitoring.
