Help!

So my period is three days late now!! No symptoms to make myself believe I might actually be preggers, so I'm too nervous to take a test!! Every now and then I'll get a sharp pain on my left side near my ovarie but not like normal period cramps and no signs of my period coming either! My boobs have swollen up and that's very unusual! I don't want to test and it be negative and be upset, idk what to do!!