3 days

Okay so now I'm 3 days late, took a test early this morning and it was negative. 
I don't feel like I'm going to get my period, I have no cramps, but my breasts are a lil swollen and I have the blue veins popping out ,my lower back has been killing me, my hunger has increased a lil. Is there still a chance I could be pregnant ? And when should I take the test again ?