Hello, First of all, you have to undergo one blood test for beta-HCG to confirm/ exclude pregnancy at the earliest. Early pregnancy test may give negative result. Only ultrasound scan can estimate the period of gestation in this case. In exclusion of pregnancy, reasons for missed period with irregular spotting are hormonal imbalance (most common in this case), stress/anxiety, thyroid problem, ovarian cyst, wt gain / extreme loss, irregular eating habits etc. Need to investigate properly to rule out underlying pathology by USG lower abdomen & complete hormone assay including thyroid profile etc. Consult with your gynecologist for proper guidance and take suggestive measures accordingly. Avoid stress/ tension, take healthy diet with Vitamin & iron supplements, control body wt by regular physical exercise and take sound sleep. Be well and take care.