Hi..if u have a history of regular periods ..I would advise u to repeat the test after 48 hours if u still haven’t got your periods . And even then if it comes negative then u can go to the hospital and get ur b hcg done ..that is a blood test that will detect even small amounts of pregnancy hormones which the home test doesn’t detect..u need to meet up with an obstetrician also who will advise u on what to do next