Ways to raise % of a baby girl?

I read somewhere that there are certain sexual positions to help in conceiving a girl vs a boy. Has anyone heard of this? We are currently trying to conceive and I already have 2 boys and would love to have a girl this time around...just wondering if there was any accuracy to this? I already read that having sex a few days up to ovulation increases the likelihood of conceiving a girl. Whereas having sex before or on the day of ovulation increases the chance of conceiving a boy. 🤷‍♀️