Did anyone do the necklace gender thingy where you take a necklace and put it over your belly and if…

Did anyone do the necklace gender thingy where you take a necklace and put it over your belly and if it starts to swing B/F its a boy and circle is girl? I did with my son. The necklace went back and forth crazy and it was correct. I just did it now and it went in a circle CRAZY! And my arm was sooo stiff I didnt move it one bit. I PRAY its a girl!!!