Hi everyone new to this or any other forum. 28yo male, 5'9" 140lbs, 6% body fat.

I've been reading alot of articles about naturally thin people putting on mass but I'm having an insanely disappointing start.

Last week I ate between 3,500-3,950 calories and running 2 days a week and lifting 3 days. Here's what I figured:
1,950 calories used just by subsisting
450 calories avg/day for 45 minute workout
300 calories from a crazy metabolism
That totals 2,700 calories needed a day. For almost two weeks by this math I had a 1,000 calorie surplus daily yet I am STILL down 2lbs from two weeks ago.

How is this possible? Is it that I am burning fat? Anyone ever heard of someone's metabolism being this fast? I appreciate any advice ahead of time!