When should a blood test be takern for missed period I had one 5 days after my missed period want to know if it was to early to detect?

2 weeks. It may show a positive result as early as 11 days after conception. Otherwise, one would expect a negative test until that time.
Any time now. 5 days after a missed period would have been positive if you were pregnant. Usually by that time urine pregnancy tests are positive in true pregnancies.