The definitive way? Haha.. NIPT test at 12 weeks or the foetal anomaly scan at 20-22 weeks. The other old wive’s tales ways weren’t always accurate for me. Lol
Don’t believe old wive’s tale. I tot mine was a boy but it turns out a girl... you can’t really tell until they do the scan on certain weeks.
Run a test with the gynae would be the most accurate