Didn't start my period today..

I took a test when Glow told me to at 12 or 13 DPO, and it was negative. And today I was supposed to start my period and AF never showed. Should I wait another couple days to take another test? I took the first test after I got off work (we both work midnight shift) because my DH was getting excited and kept telling me to take one and was heartbroken when I came out and showed him a negative. We've been trying for about 8 months now and we both are really hoping this month was our time. So ladies, what would you do if you were me? Thanks in advance!