i think im pregnant

i scared because my period is 3 days late and im peeing like crazy im tired my boobs were sore the other day but thats over..im havin bad cramps in da lower part of my stomach…main reason im scared is because of my missing period…my friend say i should hold off on da pregnancy test fo a week or 2 to see if i get my period or if i dont to see if im pregnant..what should i do…