after ovulation scanty bleeding for a couple of days is normal,If bleeding is lasting longer,it suggests hormonal
disturbance/ some cervical problem.Ovulation is 14 days before the expected date of expected periods.
The bleeding you have 3 days prior to to the periods can not be due to ovulation. The HPT you did before menses was +ve because of the scanty bleeding ,which got -ve after the blood was cleared.
I would advice a consultation of Gynecologist for physical examination, investigations( as per need), & treatment after evaluation of the results.