Gender Prediction

I’m the most impatient person EVER so having to wait 7 more weeks to find out what I’m having is a nightmare 😐! I’ve been doing research and read that sperm carrying the X gene although it moves slower it lives longer than the Y gene, so if you have sex 2+ days before ovulation there is a higher chance that your having a girl. We had sex on the 8th June and I ovulated on the 11th so by my calculations I have more chance of it being a girl. Can anyone confirm that this was true for you? Or any further inside into this? Like I say this is just stuff I’ve been looking into cause I’m so excited 😆 to find out what I’m having, I’m not going to start buying pink things straight away 😂🙈