Life is at the center of everything

[Angrboda]

If you're going to choose the beginning of the life cycle of a human as a data point, it only makes sense to choose the beginning of the life cycle of the universe as the other data point. It's called being consistent. Instead, you choose an arbitrary time during the life of the universe, and an arbitrary time during the life of a human, and an arbitrary scale to measure it on. Therefore, your result is simply arbitrary; it means nothing because you've chosen the values without rhyme or reason.

A logarithmic scale is the scale of choice by the scientific community when comparing a broad spectrum of sizes. I wouldn't call it an arbitrary choice as you suggest. Default choice of the scientific community would be more appropriate.

Logarithms were introduced by John Napier in the early 17th century as a means to simplify calculations.

Prior to the seventeenth century, linear scales were used for everything, from weights, to scales on maps. Linear scales are still the most common.

If you would like to use the "beginning of the life cycle of the universe" as one end of your scale instead of the planck length you will need to invent a new physics which has more explanatory power than general relativity and quantum mechanics. The planck length is as close to the "beginning of the life cycle of the universe" as we can currently get.

I don't need to know the exact size to know that it is much smaller than a human egg and thus if it is used, the human egg is no longer at the center of the universe.

The only way it works if you arbitrarily choose a logarithmic scale, choose the beginning of a human life, the middle of the life of the universe, and for no particular reason, the planck length.

If current physics is correct, then the universe will keep expanding, which means the human egg is only at the center of a logarithmic scale of sizes for a specific, arbitrarily chosen, period in the life cycle of the universe. Since it's a purely arbitrarily chosen time period, the meaning assigned is purely arbitrary.

Even if we accepted that being in the center in terms of size meant something in terms of being in the center of the universe in terms of meaning, which we have no reason to suppose, your comparison doesn't work.