does anyone know what is the earliest a pregnancy will show up on a test. ive done one but it said negative, but i just know im pregnant. i havent had a period since giving birth so cant use that as a guide. last time, i also had a negative test but was pregnant. i know jsut because i feel different, my smell has changed, unquenchable thirst for coke, a queezy feeling (no actual sickness though) and tiredness. all the same symptoms which show early in my pregnancies. its the smell thing that makes me think, has anyone heard of this/experienced it?