Is the Ramzi method and Chinese gender calendars always right ?

Sheprentice • From GA born and raised, I'm 28 and mom to 2 amazing girls 1 biological which is my world she's 4! Baby #3 due 9.16.16
So this is my last pregnancy and I was just wondering has anyone had these two things come out wrong? Just curious I've looked into both and they say I'm having another girl which would give us 3 BUT I really want a boy. I would be over joyed with a girl as long as baby is healthy I don't care BUT I was just curious to know if in fact these two things have come up wrong for anyone else.