[guillotine_blades]

Make sure it has been atleast 14 days from ovulation, and take another test. In most women it takes anywhere from about 10-14 days for the hcg hormone to get high enough for even the most sensitive home pregnancy test to pick it up. If it is negative, calm down. It is completely normal to have irratic periods while in your teens. If you go 3 months without a period, contact your doctor (if you aren't on any hormonal birth control) and if you are on hormonal birth control, there is actually no need for a period and BCPs actually stop my periods sometimes.