While nothing is 100% I would pay more attention to Diet, PH and your biorhythms and moon signs!
I have seen tons of girl sways fail because of the woman's biorhythms and the moon signs! Mine included, even though I only swayed with DS3!
If you go to cycletourist.com and put in your info it will give you your biorhythm.
For a girl - you want the RED line at the top and the BLUE at the bottom, that is Strong girl! It would even be better if the day you conceive has a RED vertical line, but avoid the BLUE lines going down!
With this pregnancy I was in Strong girl AND a female moon sign, but coincidentally conceived on a BLUE critical day and now I having my 4th son! This one was a major surprise though, as DS3 was only 7 wks old when I got pregnant!
Hope i didn't just confuse (or scare) you.. Lol 
Learning all this stuff over the last year or so has made my head spin! LOL
DH
40
ME
33, married since 2002
Cole
2004 Caiden
2006 Kody
2011 Jace
2012 My UNplanned home birth baby...
"Boys are meant for kisses and hugs, For watching rainbows and catching
bugs, For sharing all of your favorite things, For books to read and
songs to sing. Blue jeans and trucks, scrapes on his knees, Running in the Dirt, and being a tease. Making a face, and build and destroy. There's nothing like just being a BOY!" ♥♥♥♥