Thanks so much for all of your replies.
Actually, what has the most influence on determining the gender of a baby at conception is the Ph and the ion status of the mother's body. The Ph and Ions are most influenced by the diet of the mother; I've been studying gender and conception for three years; I have a background on molecular science.
The male carries the x or y sperm but he isn't the determining factor, our environment is.
The only reason that the day of month has anything to do male of female is that your environment changes down there the closer you get to ovulation. Egg white cervical mucus favors the y (male) sperm because of it's higher Ph. If your Ph is already low in your body as a whole, it will make no difference what day you have sex, the sperm probably won't be influenced by anything but the low Ph and negative ions, usually resulting in a x sperm winning. I said usually, but there is obviously a 50/50 chance of either. The only thing that is 100% is PGD.
I did some research on babies conceived within a fifteen month window after weight loss surgery (the 15 months being from the date of the surgery); 17 babies resulted in 12 girls and 5 boys.
It's interesting to say the least, for me anyway. I don't think I'll be having anymore babies, but still interesting.