You sound just like me with my third baby!! When she was ready and the time came, I knew it and had to convince the dr/nurse to check me - I was dialated to an 8! Enjoy this long labor, it makes the more painful part shorter and easier to endure. With my third baby, I was able to go all natural because I had to pitocin and no epidural...it was by far my easiest labor (better than the ones even with the epidural, believe it or not!) and by far my easiest recovery. I was amazed at how great I felt after she was born. I had so much energy!
Anyway, follow your instincts. When you feel it's time to go, don't let the dr/nurse tell you otherwise. The worst thing they can do is check you and send you home. That is why they are there. I will also say that I labored with baby number 2, 3 and 4 for almost a month each...be patient, your body is just a little more practiced and is doing more of the work ahead of time now. Good luck!!