if i had sex last on the 3rd may and i did a pregnancy test on 14th june?

which is 6 weeks after sex would the test definately show it up by then? as some woman on a forum said that that she did 8 tests with 12weeks of having sex and they all came negative and then when she went doctors it was positive at the 12th week i am thinking that mayb she didnt test properly as mine on the 14th june came negative it was also negative 4 weeks after sex is it a clear negative?
 
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