Yeah thats true. Its only 2 days. And even if you were you wouldnt be able to tell with a 2 day delay. You need to wait at least 2 weeks or so. I found out about 2 in a half to three weeks after my period was late. I'm 12 weeks pregnant now.
Well one thing is for sure... You should never bleed for more than one week so I advise that you check that out.