Dilated to a 4 1/2 37wks 3 days

Ok so I have a general question and I know all pregnancies are different especially mine. But I was just curious to know of "others experiences". So I am scheduled to be induced at 39wks,but everyone along with partially myself feel that I will not last to make it that far seeing how far I am already dilated. This is my 3rd pregnancy,so with my other two pregnancies once I got to 5cm I labored extremely fast. My questions are....did having sex cause you dilate faster? Was there any signs that stuck out as far as feeling like a certain way when you did dilate more? Also I might add in that my other two I couldn't tell when I did dilate further because of the epidural. And I have also never dilated this far along naturally,so this pregnancy is wee but different. I would love to hear others experiences though :)