That is pretty darn fast! BUT if you are feeling good and not overly weak yada yada... Then enjoy it! Remember also that it will slow down soon but what an awesome start! Congrats!
Did u look anything up online? I haven't yet but am curious myself. I know for my dark knees, it's good to scrub them (I've even pumiced them) and moisturize. It has helped a lot and I'm not even very diligent about it. I wonder if it wld be similar for the thighs