Hello, Irregular period or spotting may be due to several reasons like stress/ anxiety, hormonal imbalance, uterine pathology, pelvic/ vaginal infection etc. You may undergo one blood test for beta hcg to rule out suspicion of pregnancy. Early pregnancy test is less significant. After that you can consult with gynecologist for pelvic examination and other relevant investigation like USG, hormone assay etc to pinpoint the diagnosis. Take healthy diet with iron supplements, maintain genital hygiene and drink plenty of water with salt & sugar. Be well.