Honestly, it is a 50/50 shot each time. Doing all this swaying may increase you chances by 1 or 2%. Of course, of all the people that try for a girl, 1/2 of them will tell you it 'worked' because they got a girl. But there is no way to tell if any swaying really worked or not. And think of all those with b/g twins....obviously it is not all timing or pH.
I had two boys. Tried like heck to get a girl (did all the supplements, timing, took clomid, used sun/moon signs, etc) and it was boy number three. I don't believe it works....seen too many people that have tried and failed. And it sets you up to think that this is your girl because you tried so hard for her....that is until your ultrasound.
The only 100% is using IVF with pgd (which we tried too, but didn't get pregnant).
Our fourth and final child was a girl....but with absolutely no swaying. it was an oops (cycles weird after IVF) and if you look back to timing and some swaying factors...it was a pretty good boy attempt. So my girl attempt gave me a boy....and a boy attempt gave me a girl.
I am sorry I am such a sourpuss over this. Some people make it seem so easy to have a girl...all you have to do is 'x, y, z'. But it simply is not true. If it was, do you think there would be gendercide in other countries? And the person who really figures it out would be one rich person!! Please do not invest a lot of time or energy into this, it could leave you heartbroken.
Enjoy that perfect family you have and if you seriously want a girl....research IVF/PGD. Otherwise, expect #6 to be a baby.....nothing more.