A 28-year-old woman with a history of GERD is scheduled for emergency cesarean section under general anesthesia. She is at term, in active labor, and has consumed clear fluids 30 minutes ago. You plan RSI with cricoid pressure. After 3 minutes of preoxygenation, you administer propofol 2 mg/kg IV and succinylcholine 1.5 mg/kg IV. The patient loses consciousness. Before you apply cricoid pressure, you notice she is breathing spontaneously at 8 breaths/min with visible chest rise. What is the most appropriate next step?