Dilating?

Is there pain when your cervix just begins to dilate? I have this sharp pain really low in my pelvis and down in my vagina. It's not shooting, it comes and goes and lasts about 10-20 seconds. Am I just starting to open up? I read you can dilate a few cm in the weeks leading up to labor. I'm 37 weeks. Is it problematic if I am dilating and he's breech?