Missed peruod due to lack of excercise?

So im 15 and i play basketball im NOT ualy active and my period is 2 weeks late during baskrtball we do extreme crossfit workouts which include weightlifting body weight and lots of running i havent worked out since school got out and my period was supposed to come around the 30th of may and it still hasnt come could it be due to lack of working out and how do i get it back to normal