When should take a pregnancy test?

my last 2 lmp was june 25 th then july 26. Think that we could possibly expecting and bd on august 6th but not sure when i should test and no sign of A.F. but also no real signs of pregnancy like the first pregnancy which ended in m/c last year and doctor been said it was ok 2 continue ttc since then. wat should i do please no smart answers only serious answers.