found some kindof statistics hope this helps!
Here are some things to think about as you approach your estimated due date. Babies have their own calendar. As much as we would like to naturally induce labour as soon as “we” are ready, labour starts often unpredictably and sometimes later than what mothers would like for their own comfort. Babies will come at 38 weeks and other times will need 42 weeks. Technically you are not overdue or what is called “postdates” until 42 weeks. However, today it is more common to hear from providers that you are “overdue” even if your due date was yesterday!
So in essence, your due date is only a very rough target; which is why it is referred to as an EDD - estimated due date. Your own baby will likely come within a period of four weeks between 38-42 weeks. Only about 3-5% of women actually give birth on their due date not to mention that the majority of women don’t go into labour until after their estimated due date!