Hello dear Understand your concern. I think it is a side effects of emergency contraceptive pills. It is just menstrual bleed that combine with cervical mucus and secretion and remain in uterus and produce yellowish discharge. It will remain for 4-5 days. But if it is associated with foul smells, itchiness, redness and abdominal cramp, It may be vaginal infections and require gynecologist consultation and treated by antibiotics and anti fungal drugs. It should be confirmed by : cell culture, PCR, NAAT, Gram stain, microscopy of vaginal cells CBC, ESR, Urine routine and microscopic examination. Advice: Maintain hygiene Wear loose pure cotton inner wear Wipe area after sex and intercourse Drink more fluids Take healthy diet. Lactobacilli orally or vaginally Hope this may help you best regards Dr. sagar