50/50 chance. Bump size, baby's HR, carrying high or low, carrying all round or to the front, nausea / no nausea, heartburn / no heartburn, early movements and late movements, none of this tells you whether you're having a boy or a girl. The way your bump grows is just the way it grows, heart rate will vary 130-170ish regardless of sex, heartburn just *****, and movement is how active your baby is. The way any of these relate to sex of the baby is just old wives' tales.