I'm not sure if I'm pregnant! Please help.

Jamie
My cycle is 26 days long. We had unprotected sex on April 14th during ovulation 15% chance. I'm in my 23rd day of my cycle. I'm two days late for my period. I did take a pregnancy test 5 days before my missed period it was negative. I did not take plan B. I feel noshes, cramping, headaches, acid reflex, I had a foil taste in my mouth. I don't know??? Uhhh... Please help.