Is it possible

Af came on cycle day 25 instead of cd28 or 30, wasn’t very heavy and lasted 2 and half days, did a test the day after and was negative, anyway I’ve been feeling sick and tired on and off for a few days and had brown spotting yesterday (a week after period) for about an hour, so just done a hpt just because I was curious, there’s a very very faint line not sure if you can see it on the pic as it’s really hard to see but is it possible that it could be a positive even after 2 and a half days of bleeding and a negative test the day after the bleeding stopped