What Causes Mild Pain In Lower Abdomen Few Days Before Delivery?

Respected Sir, My wife s pregnancy due date is 13 Tph may . Today 4th march she telling me at morning time that she is feeling some cramped on lower bely along with a mild pain . At time of earlier pregnancy she suffered same thing . That time doctor given duvadinal tablet. Please suggest what I will do now . Regards Soumyajit Banerjee +0000