Xeno, how did you come up with it does not matter. Is it your vast experience with testosterone replacement therapy (TRT)? Unlikely, since your in your mid 20's. In fact, you have no cycle or testosterone replacement therapy (TRT) experience according to your posts.
You should take the advice of another famous Canadian, Brian Tracy. He says "Everything counts!" It is especially true here.
When you're dealing with such small volume of test, yes ~ it actually does matter.
There is a technique of placing a small air bubble between the plunger and the liquid when injecting that makes it possible to deliver all the material (or you simply over draw a minute amount to cover the discrepancy).
It's not about over analyzing. It's about making an effort to be as accurate as possible.