You should not.
Changing 2 major variables won't give you the 100% aspect of the product.
Stay the course on your routine and diet this way you know how the product affects it.
For example.. throw in 5-6 more working sets or add more volume, then if you do get tired or exhausted you will claim the product doesn't live up to its reputation when in reality you may be overtraining
add 200-300 kcals and the scale moves quicker then you want. Then you will say the product makes you add weight when in reality it is your caloric intake.
A supplement is that.. a SUPPLEMENT. to supplement your dietary intake and training routine.
The only variable that should be changed in your log is the addition of the supplement, because with that it shows you its true potential and side effects.
Add volume and calories, then you cant really say if X or Y was the reason fatigue, performance, endurance, scale movements, body recomposition. Just keep all things the same, this way you can note the difference in your current routine and caloric intake.