Open Question: I gained weight!!?????????

Hey.. what the hell.. so i've lost a total of 44 pounds.. i eat as for normal, since im used to dieting, eating small portions and run about 5 days a week, cardios and stuff.. yesterday i just noticed i gained 2 pounds.. i don't recall eating too much or slacking my exercises.. my friends told me not to worry cause its probably muscles growing.. is that true?