blood test

  i am 5 dpo and i wanna know how soon can i get a blood pregnancy test?should i wait until i miss my period or i can do it now?can this test be false negative or positive?
  thanks.
  sophia.
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Dear Sophia
Although the hCG level can be positive as soon as implantation takes place (around 5-7 days post conception), it is important that there can be some variability in early pregancy events. I would suggest that you obtain a serum hCG around the time of the first missed period.
Serum hCG done at the right time has a VERY LOW false positive and false negative rate.