Week 2 muscle building program update

Week 2 was another tough week and I have felt constantly tired after my workouts, this started to pass by the end of the week.
My current weight is 212lbs according to the scales this is a lb more then I weighed in the beginning but if you look at the table below you can see that I have made some progress.

Weight 212lbs
Waist 38
R bicep 15.9
L bicep 15.3
R thigh 23.8
L thigh 23.5
Chest 45
R calf 17
L calf 17
Body fat % 18.69%
Fat mass 39.63
Lean mass 172.37

I have lost 2.62% body fat in 2 weeks.
I have lost 5.33lbs of body fat in 2 weeks.
I have gained 6.33lbs in lean muscle mass in 2 weeks.
In my opinion they are good gains for only 2 weeks on the program and I am excited about the remaining weeks where I hope to decrease my body fat percentage and gain muscle mass even further.
I don't feel much different and the measurement gains are barely noticeable because they are only small, but are a good sign of the great things to come and really motivational to see them on paper.
There is a possibility that the gains are due to inaccurate recording, however I weigh myself at the same time as taking the before stats.

For measurements i took them first thing in the morning using the same scales, tape measure and caliper.