Does that string on a ring thing work for predicting pregnancy and gender?

Heaven
My boyfriend held a ring on a string up to my tummy to see if I was pregnant and it usually doesn't move but last time it did it started moving in circles. I took a test but it came out negative and he thinks maybe my hormone levels might just be too low to detect on a test right now. Has anyone else tried it and if so how did that go for you?

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