I am 35 weeks pregnant and I went in for my appt today and found out I am 3 1/2 centimeters dilated. I have been having low back pain and painful cramping, like menstrual cramps for the past week or so. The doc said she could feel her head as well. Major tightening in my stomach along with the cramps. Is this the beginning of the end? Or could I go on like this for another month? I just want to know what is normal. This is my first pregnancy.