Boy or girl

Hi I'm TTC I have come across some information about attempting to select the gender of your baby. It stated about time of intercourse relating to ovulation ( 2-3 before for a girl one the day or day after for boy) and other factors such as ph level of your intimate area which could be determine by the foods you eat. Has anyone read these type of suggests and if so do they work? I would ideally  prefer a girl because I feel I could relate to females better however I would not be upset if I had a boy. ( I feel ready to have a baby now as I'm open to having either which is the reality of it ) but just wondered if there was any proof in these comments?