It depends how long your cycle is.. If it's 28 days then start testing at day 9 however if you are like m e, that would just waste a few tests as I should start testing later , on day 12 ,having a 31-32 day cycle..... Hope that helps...

Sounds like you have the right idea, and for a boy i think it's the day you ovulate to a few days after...... Whereas a girl is before you ovulate.... best of luck... I'd be interested to find put whether it works... The gender swaying