Gender Swaying

We've been trying gender swaying by following the  shettles method. We have an adorable little boy that I love dearly but would love to have a little girl too. My cycle postpartum went from ovulation on CD 14 to CD 20-25. This method is so frustrating. Do I just let it happen since conceiving a specific gender is out of my control? This cycle was the first time I think we DTD three days prior to ovulation including ovulation day.