Implantation bleeding or period

Period was due to come on 15 Aug. For the past 2 days I had spotting. But it was red and not brown as people describe implantation bleeding to be like. Usually once I have spotting, the next day my menstrual flow will come. But the 2 days of spotting was just a one time thing and the rest of the day no spotting at all, just usual vaginal discharge. Should I test with a pregnancy kit or wait it out?