A bit of advice please fellas

In the past 2 weeks I have put on 10lbs in weight. I am only eating around 2000 calories a day
Can this be that the extra weight is muscle rather than fat??

I am uncertain because I don't do much weights work

My daily routine (5 days a weeks)......


Chest press - 4 sets of 12 50KG

Peck Dec k - 4 sets of 12 50KG

ABS machine - 5 sets of 12 50KG

Is this enopugh to be bulding muscle and putting on weight like this?

Cheers