Should I test?!

I was supposed to start my period today and nothing so far.. I can usually feel it coming on before or notice symptoms of it coming, but I haven't noticed anything so far. I took a pregnancy test on the 22nd and it was negative. Should I test again or wait a couple days to see if it shows up? I don't have any tests on me so I'd have to pick one up. Just don't want to be disappointed..