how long for positives

So I'm only 3 days late but with assisted fertility (and super regular cycles) I'm so excited (cautiously). My tests have all (5) been negative. I even tried an expensive brand. People keep telling me it might be too early. So my question is how long is it typically until you get an accurate test? Some tests say accurate 99% on day 1 of missed period. Some say before but I'm after and still nothing. Nauseous, cramps, fatigue, moody, & boobs are not fitting into the new bras that Victoria secret fitted perfectly LAST WEEKEND. Help I'm clueless and excited.