Here's the theory (very hard to find my old stuff on here; only have myself to blame):
[URL unfurl="true"]https://www.excelmale.com/threads/hcg-plus-androgens-other-than-test.25623/post-232877[/URL]
You only have single points in time. What you would like to know is area under curve (AUC). In the absence of additional info you know that AUC for fT is proportional to dose. It is probably pretty close for both cases (you are going through the same mg of testosterone each week). But there is some variation in your serum concentrations over the week (exercise vs no exercise) as your single data points show; your liver clears the T faster or slower which changes your elimination rate constant. There is also the term called distribution volume.
I wouldn't worry about it. But if the single time point is concerning then do what makes you comfortable.