** Thanks for contacting with your health concern. 1. As repeated tests came out negative thus although it seems to be a remote possibility to get pregnant, even then check with your GYN/OBG doctor or for the second opinion. 2. As last periods were normal and now missed since 5-6 days thus it can be upsetting and confusing when your period is late and there are no positive signs of pregnancy, so it could be due to certain lifestyle changes were done recently [if any] like: - excessive stress - loosing or putting too much of weight - heavy exercises - suffering from PCOD [polycystic ovarian disease] or having a high level of prolactin [hormone] 3. one commonest cause [apart from above reasons] is functional ovarian cysts which will prevent bleeding, thus it is wise to get an abdominal USG done which will reveal if there are any ovarian cysts. PS. since UPT is negative so it is best to seek suggestion to know why you have missed your periods, a Gynecologist would be ideal to consult, for appropriate examination/investigations.