Should I be concerned

I go to the gym twice a week and ive lost 15 pounds in the last 2 months despite having a low bmi, now im almost underweight but im adding lots of weight to my lifts, i eat 3000kcal a day and i dont know whats happening, on average i add 10lbs to my lifts every 2 weeks, ive already been lifting 2 years and nothing like this ever happend. Is this something i should be worried about this. Im also not on gear.

 

[pilaric]

losing wieght and adding numbers, your fine dude thats golden