Old wives tale : necklace

Have any of you tried the necklace test to see what the gender of your baby will be? (Side to side supposedly means boy & a circle means girl?) 
I was bored tonight and my husband was sleeping so I used a necklace I wore for my wedding and tried it twice. Both times it went side to side THEN started going in a circle. Maybe I didn't use a good necklace but so many people swear by this old wives tale and I haven't been able to find anything about what it means when it goes both ways in one try.   Twins?? Any input? Just bored over here lol