Have you ever felt this way?

30th, I had an appointment with my delivery doctor. He said the baby is already head down and that I should be expecting her to come any time.

This morning I felt fine, I could move and all that. I felt my daughter push up against my ribcage and then my pelvic area, lower back and hips became real sore. I can barely move, I can't lift my legs and I feel cramping come and go and it's unbearable. I haven't lost my mucus plug or anything. Is this a possible sign of early labor or something? Due this month on the 17th!!