Two weeks into lifting -- your body can go thru all sorts of adjustments while it gets used to the new stresses it is going thru. What are your stats? Unless your damn short, lots of guys are light with a speedy metabolism -- if that's you, that means you have to fight against your metabolism - the good news is that you probably won't have a lot of issue w/ extra bodyfat if you jack up your food intake, but you probably have to try a lot harder to eat more to build muscle mass.
If you really want to do this whole thing right & get to your goals not only w/ a good solid base of muscle but also w/ a good solid base of knowledge you need to understand nutrition and what works for you & your goals because diet will always be 80% of your goals. You've got a good solid strength training & core building program for training.
For your diet -- put your current diet into a food counts program like
www.fitday.com. See what the total calories are, as well as the macronutrient breakdown--- % & grams of proteins, fats & carbs in your diet. Some basic guidelines to see about --
- total cals = 10 -15 x your bodyweight - if you have a speedy metabolism, go more like 15-20x
- total grams protein = 1-1.5 x your bodyweight - again for fast metabolism, go more 1.5 - 2.0 x
- macronutrient ratios -- a good base to start with is 40% protein / 30% carbs / 30% fats
Also don't get real hung up on your weight -- because the scale measures the weight of bone, muscle mass, bodyfat and water -- the water is what fluctuates all the time --- imagine for us poor girls w/ 'that time of the month' where we can gain like 10 lb of water weight in a day. Of course it is water weight so it does cycle thru, but it can be a real mindfuck to see those types of weight swings on the scale.
Instead look at the scale for TRENDS up or down, but if you can get your bodfyat measured at your gym to get a better understanding of the relative changes in the ratio of bodyfat & muscle mass on each measure. Or just pay attention to how your clothes fit -- getting too loose & baggy? Getting tighter around legs / arms, etc...
I.e. pay attention to other indicators besides just the scale. But I'd also just ignore the scale unless you just really see things dropping --- eat & eat & eat and train & train & train.