Not so, but believe what you want. The odd's of hitting a female on the 1st egg is 1:2, 2nd egg is still 1:2... 3rd egg is still 1:2. The odds do not multiply exponentially as you go as it is per each individual egg. You can extrapolate it for the clutch if you wish for simplicity, but it is per egg and they are not the same. You contradict yourself by saying the odds change after you hit one female.... not so. The odd's are still 1:2 per egg- PERIOD.
Xx times Yy has 4 possible outcomes per egg. Draw a Punnett Square. After the 1st egg is sexed look at the Punnet square. Did it change? Nope.... that's cause it's per egg. If you have one child and it is a boy that does not decrease your chances of having a boy on your next child.
We're not talking statistics about flipping coins and rolling dice. We're talking genetic odd's on any given single egg. Each egg has it's own odd's. The previous egg has no bearing on the odds of the next egg.