Hello, Here, you can undergo one blood test for beta-HCG to rule out pregnancy confusion. Other reasons are hormonal imbalance (most common) due to effect of implant, stress, irregular food habit, over weight or loss, thyroid disturbance, increased prolactin level, ovarian cyst etc. In exclusion of pregnancy, you should consult with your gynecologist for clinical examination & relevant investigation (like pelvic USG, hormone assay etc). Take suggestive measures accordingly. Take healthy diet with vitamin & iron supplements, avoid stress by meditation/ yoga, control body weight, maintain genital hygiene & take sound sleep. All the best.