My last lmp was on 4th May 2015 I am

Patient: My last lmp was on 4th May 2015. I am waiting to get pregnant soon.I am having some symptoms of pregnancy. I have done a blood test today so that I was very eager to know the result. But disappointingly it was negative. My expecting menstrual period is 1st June. Still 4 days to go. I want to know is there still any possibility to become positive?

Symptoms: Symptoms – nausea, lower abdominal pain, white discharge