Sounds to me like you might be stressing your body out. Stress can cause a delay in your period. Try buying those First Response tests, helped me find out about a week after my missed period. If you start feeling tired all the time, lose an appetite, and can't focus on anything other than worrying, take a test.
Sorry for ur lost. I would give it another week and. Retest it mite b to early to detect the hcg in ur body .. Good luck to u