Old wives tale sign of a girl

I've heard the saying, "Girls steal your beauty ". I hear others talking about how healthy their hair and nails are and how pregnant women have a glow. Well I have dry hair, brittle nails, acne and just look run down. Is this a sign it is a girl? LOL i thought after the first trimester Some of this would get better but so far no luck. Anyone found truth to this old wives tale?