Dye run, indent, or vvfl?

Hi, this might be tmi but here it goes. 
I tested because my AF was extremely different this cycle which made me curious. I normally have 6-7 days of bright heavy bleeding, heaviest in mid morning while lighter at night but this cycle i only bled for 4 days. The first two days were very very light and obviously old blood, a dark brown, but the last two days it was a medium flow and dark dark red in color before switching back to brown. I was just wondering if i should keep testing, see a doctor, or if I should just count it as AF? 
Now I swear I see something in person but it could just be an indent or dye run. I'm sorry for the crappy photo. I work super early so it was taken at 5am (and sadly it was with only a 2hour hold). The photo was taken within the time limit @ 5min mark. Please give opinions and suggestions. Tweaks would be welcomed as well. Thanks ladies!