Hello, Here, you need to undergo one blood test for beta-HCG at the earliest to rule out pregnancy. Early home pregnancy test may give negative result. Other reasons for delayed period are hormonal imbalance (most common), stress/ anxiety/ mental upset, ovarian cyst, irregular diet pattern, wt change, thyroid disorder etc. Consult with your gynecologist for relevant examination & investigation like USG pelvis, complete hormone assay, prolactin level, thyroid profile etc. Avoid stress by regular deep breathing, take healthy diet with iron supplements, keep bowel habit regular, control body wt by regular exercise/yoga and take proper sleep. Be well & take care.