for trying to conceive a boy here is a few hints/ wives tales.
1. have sex close to ur O as possible
2.try to keep ur diet as anti-acidic as possible as the male sperm prefer low acidity
3.when having sex try having it in positions where ur partner goes in deeper as the male sperm are quicker will give them a heads start against the slower females

cant think of any others for now these are just ones i have read about, i will b doing the opposite since i would like a girl