baby was head down now breech

Baby was head down 2 weeks ago when I had Preterm labor stopped. I'm now 30 weeks and went in for an ultrasound to monitor fluid and baby is no breech. Does baby still have enough room/time to flip? What does it feel like when baby flips (since I aparantly didn't even notice)? What are the risks if my OB force flips if baby doesn't flip himself by my due date? 
If I go into labor early again and he's still breech I'm  prepared for a Csection. I don't think I'm comfortable with force flipping.