Weeks, Days, or Hours

At my last OB appointment last week, the doctor said my cervix was about 1 centimeter dilated and she could feel the baby's head during an internal exam. When I asked what that meant, she said, "it means the baby is in a good position and that you could deliver in weeks, days, or hours." What?! What kind of "medical" advice is that?! Can't they do any better than that?! I'm trying to be Zen about the whole thing but haven't been very successful lately. I'm sure hormones have nothing to do with it.