I have been meaning to do this for a while. I looked back at Swaying Attempts and Outcomes, to test the theory that the moon sign present when you conceive, determines the gender. I think it is interesting because some people do such wonderful sways and still end up with a gender opposite. When people put the suspected O date in their sway, I had a look at what moon sign they were in. For a couple of them, the moon sign was close to changing, but the vast majority were clearly in one gender for at least a day, giving plenty of time for conception to occur. Of course it relied on people putting in an accurate O day and some people either didn't know when it occurred or didn't include it in their sway. I only did ones I found from 2011.
I totally understand that not everyone believes in the moon theory, and I am not saying it is 100%, but it is interesting.
hope1212: O in boy moon (Sagittarius). Gender outcome= boy
HoneyRose: O in girl moon (Virgo). Gender outcome= girl
Izzyindigo: O in boy moon (Gemini). Gender outcome= girl (Always good when the theory is wrong and the desired gender is conceived!) 
Wishingforafairy: O in girl moon (Cancer). Gender outcome= girl
babydust: O in a girl moon (Capricorn). Gender outcome= girl
twosweetlads: O in a boy moon (Aries). Gender outcome= boy
alsestis: Majority of O day was boy moon. It was a girl moon toward the end of O day (Taurus). Gender outcome= girl
Fyrestar: O in a boy moon (Aries). Gender outcome= boy
proud-mummy26: First half of O day was boy moon (Gemini). Second half of day was girl moon (Cancer). Gender outcome= boy
annie912: O in a girl moon (Pisces). Gender outcome= girl
florera: O in a boy moon (Gemini). Gender outcome= girl
yy91: O in a boy moon (Gemini or Aquarius depending if O was 6th Jan or 1st June). Gender outcome= boy
Sunset: O in a girl moon (Taurus). Gender outcome= girl
Babushka: O in a girl moon (Scorpio). Gender outcome= girl
So there you go. Something else to consider!
If anyone knows their O date or suspected future O day and wants to see what moon sign it was or will be, have a look on the calendar on Lunarium. Adjust the times given from London time to wherever you live. If you are in Australia, I have a calendar with the times in Australian Eastern Standard Time, so it is easy to adjust for the state you live in.
Most importantly, GL with all your sways, and if it does not work, feel happy that you did your best. Peony.