You can do it over the palm of your hand if not pregnant & it is meant to tell you how many children you will have & their sexes. My friend said it was right for her, but not sure I believe it at all. Know the ring over the bump thing is often wrong! All piffle just like those silly chinese gender chart things!
i did this with BabyDragon. If I thought hard about the ring going up and down, it went up and down, if I then thought about it going round and round, it changed direction and went round. It is, of course, a load of b*llocks and right about 50% of the time on average.