Question for girls: period 4 days late, but i'm a virgin. should i be concerned?

Ok. I'm 14 and my periods have been pretty regular for the past couple years, but I haven't gotten my period yet. My last one was on Nov. 21. they usually last for 6 days. I'm a virgin so i kno i'm not preg. Should i be concerned??
Update: some people have said things about exercise and i'd like to add that i have been conditioning for softball for the past couple weeks (which means i've been either working out or running for like and hour and a half 2 or 3 times a week)
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