most home pregnancy tests are pretty reliable when used exactly as directed about a week after your missed period. so for example if your period was supposed to start 12/5 then you can start testing around 12/7. home pregnancy tests detect a hormone called human chorionic gonadotropin (hcg) in the urine. because the sensitivity of each brand of home pregnancy test varies you'll probably get the most accurate result if you take the test first thing in the morning when your urine is most concentrated. be sure to read the instructions very carefully and time the test exactly as indicated. this will help provide the most accurate result. if you get a negative result but don't start your period i'd suggest you test again. the body continues to produce hcg throughout the first few weeks of pregnancy so a negative test could simply indicate your levels were too low to detect the first time. good luck!
the first day of my last period was 11/1/12 when can i take a home pregnancy test? . my cycles are usually 33-34 days.