Hello ? I'm pregnant at 22 weeks. The ultrasound technician said the…

Hello ? I'm pregnant at 22 weeks. The ultrasound technician said the placenta is low-lying but in three weeks it might rise. A week ago there were blood drops again, I went for an ultrasound. This time the doctor said she doesn't believe the placenta will rise and that a cesarean section would be needed at 34-35 weeks (I lie still, don't move, eat in bed, only get up to go to the bathroom). Can you please tell me if anyone had this experience? Could the placenta still rise?