If you've lost a lot of weigh or, had an increase in your stress level it may have delayed your period. If not you could try a different brand. If it still says no make an appointment. Finding if you had unprotected sex and when you ovulate your levels may not have been high enough to detect pgnancy
Hi Just joining your thread as to I too have the same problem same months missed last month negative UPT. See what answers or responds you get. Good luck