Myths on boy or girl

Does anyone know myths on if you're carting a boy or girl? I'm dying to know what it is. I've done a Chinese calendar and it says girl then my mom and I figured out when I ovulated and had sex, but Were not sure if girls swim slower and live longer.. Haha I'm going crazy thing about it. I had a boy and I never felt sick and now this one I'm very nauseous and have every symptom of being pregnant..