Yeah, its always a good idea to perform multiple types of RCs because they can fail from time to time. If you don't know already, the nose pinch RC is where you close of the air passage to your nose by pinching it closed. You then attempt to breath through your nose anyway. In a dream, you can still breath even though it should be impossible. You could also try to levitate off the ground, move something with your mind, read text...look away...look back and read it again to see if it changes, look at your hands and see if they are normal, etc.