Needle and thread gender test?

I saw on the internet that if you attach a needle to a piece of thread and hang it above your belly it can predict the gender of your baby. I know it's an old wives tail but I tried it.
If the needle goes around in circles it's a boy
If it swings side to side or back and forth it's a girl 
Mine spun in circles suggesting I am having a boy. Has anyone else done his trick and it has worked?  Let me know ?