What will happen at the 36 week appt?

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I have my 36 week appointment at 35+3. It's just what worked out and my doctor said it's fine. I'm worried though that my daughter is still doing full 360s. Right now her head is in my ribs. So if we go in Wednesday for the ultrasounds and she is breech, what happens next? Will there be more ultrasounds? Will a c section be scheduled?