You said that her menses are irregular but how much they get late usually? Because if menses are irregular then please repeat UPT again after a week it can be a late conception also. If it is negative than consult a doctor personally.
BASM, MD, MS (Counseling & Psychotherapy), MSc - Psychology, Certificate in Clinical psychology of children and Young People, Certificate in Psychological First Aid, Certificate in Positive Psychology, Positive Psychiatry and Mental Health
Dear lybrate-user. Thanks for the question. Many women experience abnormal vaginal bleeding or spotting between periods sometime in their lives. Vaginal bleeding is considered to be abnormal if it occurs: When you are not expecting your menstrual period. When your menstrual flow is lighter or heavier than what is normal for you. I would suggest you to consult your gynecologist for detailed check up. Take care.