Help! Am I pregnant??

Help! I am approx 18-19DPO(according to OV test)... I'm 5 days late from AF... I have sore breasts and low cramps, CM slight nausea for almost 7 days now. And I had a weird taste in my mouth that lasted about 4 days and is now gone.. I'm pretty regular and I've been pregnant before. I feel pregnant or I'm imagining really hard... :) but all my tests have come up negative. Is it possible that I could be pregnant or am I hanging onto false hope? :(