Still No AF Two Days Late FX

I experienced light cramping last week jun 26. Which was odd because I never cramp before my period. I was discouraged on July 3rd because I started having back pains similar to the ones I get before my cycle. Took a test on July 4th still neg (the cheap dollar tree one). Well I started feeling a lil nauseous on July 3rd after dinner. I have been soooooo gassy !!! AF was due yesterday on the 5th as I've been Patiently waiting to see blood,still no sign !? It's day two with NO AF! I'm scared to test again tho ??? what u think ladies my tummy been feeling mighty strange . Cycle was due on the 5th​