Needle trick?

Brittany • Hello! I`m 26yrs old married for 5 yrs we have a 5yr old daughter and 3yr old son .. We are trying for our 3rd child
Has anyone heard if the old wife's tail that if u hold a needle or ur wedding bands over ur belly on a piece of tread and it swings it means your pregnant?? I've done it before with y other 2 kids and it moves and 2 days later got BFP ... While I did it again today because we are TTC #3 and it started to move but haven't gotten a BFP yet just BFN .. Am I being to worried or am I crazy