How accurate are pendulum tests?

I’m 8 weeks and today my coworkers convinced me to do a pendulum test to find out if it’s a boy or a girl and it was clearly a boy! We asked “show me a yes” necklace circled. “Show me a no” necklace swung straight. “Is molly having a girl?” Necklace swung straight. “Is molly having a boy?” Necklace swung in a circle. Does anyone who has had a baby and did an early pendulum test know if it was accurate? I know it’s not scientific but I 100% believe in energy so I believe it can be accurate. Just wanting to hear anyone else’s experience!