I am pretty sure I'm Pregnant?

I am only 2 days late but I have every symptom last night I was so dizzy and I tested the day of my mIssed period it was negative . I'm moody emotional I have back pain stomach pain . Sneezing , different apitite . When should I test am I pregnant. I'm 3 days late now. I have had symptoms about 2 to 3 weeks