In how many days after conception can i trust the pregnancy test?

Earliest 7 days: Earliest is 7 days after conception, once implantation occurs. But, that is very early abd may be missed as a negative test. Most commercial tests are positive by the time of the missed cycle, or 2 weeks after conception. Try to resist taking a test too early, it may simply confuse the picture. Give it time needed to get a true result. Hang in there.