Why is my period two weeks late?

Periods can sometimes be late for no reason at all. Since you are young, it isn't uncommon for them to be irregular. If it doesn't show up soon, you might want to go to the doctors and get it checked out to make sure it isn't anything serious and they can do a pregnancy test while you are there just in case. Just so you know, some women don't notice any changes while they are pregnant. But I really don't think you are pregnant.