Clomid, Pre-Seed, Guaifenesin and the Shettles Method!

Adi
I'm 35 and TTC for 6 months, currently on my 3rd clomid cycle. I started clomid 3-8 on 01/19/15 and am expecting to ovulate on 01/31/15. I started taking Guaifenesin to assist with thinning out cervical mucus and increase the chances of at least a sperm reaching the egg. I didn't buy Robitussin nor Mucinex, I found at Walmart a mucus relief bottle (pill form) that it's only active ingredient is guaifenesin and its 0.88,- cents for 15 pills, can't beat that. I'm using  OPKs to make sure I don't miss the big O Day. I have also tried pre-seed before but still no pregnancy. This is my first time trying clomid, Guaifenesin and pre-seed hoping that the combination of all will make a cute little baby. I have two boys already so I'm using the Shettles method to see if we can get that little girl that I so desire, don't get me wrong I will be happy with a boy too....maybe even twins since any fertility drug increases the chances of multiples. Has anyone have a success story or is trying something similar as mentioned above?