Why is there no band on my Load chart?

Because there is not enough history behind it yet, and the screen says which part is short: it needs a number of sessions and a number of complete weeks in the window, and it tells you how many of each are on record. Until both are there, no band is drawn and no label is put on your week. A range guessed from three weeks would be narrow for the wrong reason, and reading yourself against it would be worse than reading nothing.