Pregnancy symptoms before period

Quick question. Have any of you ever had pregnancy symptoms and confused with with Pms? My period is 2 days late, my boobs are killing me, and I'm extremely moody and fatigue. I don't know if these are signs of my period about to come on(just late) or preg symptoms. I'm trying to hold off on buying a pregnancy test because I don't want to waste money considering I'm only 2days and not 2wks late. Thanks guys! :)