First off as said, you have a 50/50 chance of getting a pullet, nothing you do is going to change that... Trust me if there was a way commercial hatcheries would be all over it vs giving away the cocks as packing peanuts or feed...
As for the eggs, why are they in the fridge, are these store bought? Do you even know if they are fertile? It's best to avoid refrigeration if you plant to hatch them...
If they are white shelled, the veins should be clear as day after a week with light and even medium colored shells, if you are not seeing veins chances are it's DOA...
As for turning, as said 3 times a day minimum, if you fail to turn the eggs the embryo will usually die... More is better in this instance, a broody chicken turns the eggs up to 52 times a day... So if you are gone for over 8 hours a day, someone should be turning them for you...