Hello, Thanks for posting your query. With irregular periods, it is difficult to predict the date of ovulation, if at all. Hence, this spotting can be a premenstrual bleed, an implantation bleed if you are sexually active without any contraception or a breakthrough bleed if hormone imbalance is the cause of your irregular menstrual cycles. You should proceed by excluding pregnancy first through the blood test, follow it up with a trans-vaginal/pelvic sonogram to know the status of the pelvic organs and go for a complete hormone profile, blood counts and urinalysis along with a complete clinical exam. Please maintain a healthy weight, healthy diet and regular exercise. Hope this helps.