That's a very fine line when you rely on a more efficient metabolism due to increased LBM to counter the effects of a caloric surplus.
About all I can suggest is monitor over a couple more weeks. If you see the belly increasing, throw in a little extra cardio or move towards circuit training for a couple of days per week.
Again, it's a very fine line even if you micromanage your diet and caloric expenditure.
There are 3 loves in my life: my wife, my English mastiffs, and my weightlifting....Man, my wife gets really pissed when I get the 3 confused...
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