Теория определения пола ребенка по обновлению крови родителей

According to the "Shettles Method," to plan the gender of a baby based on ovulation day, you should have sex closer to ovulation to conceive a boy, and a few days before ovulation to conceive a girl; the theory is that sperm carrying a Y chromosome (male) swim faster and reach the egg first when you have sex near ovulation, while sperm carrying an X chromosome (female) are more likely to fertilize the egg if you have sex a few days before ovulation.
Это я изучала когда брала класс эмбриологии в университете. Если нужно я переведу.

В интернете есть калькулятор , но по обновлению крови у нас не совпало