Bleeding 5 days after AF ended

Heya ladies,

As you can see this is my current cycle:

So today I noticed some brown blood when I went to the toilet in the morning, and later it was red, fresh blood with pink clots in it. My period ended 5 days ago (and the last days had been very light, mainly brown blood).

It's not been a huge amount of blood today but it's never happened before. I once had mid cycle spotting but it was during ovulation, this is completely unusual.

Anyway I have a smear test booked for the 20th by chance so will ask the doctor then, I just wanted to know if anyone had any ideas what this could be and whether I should be going to the doctors sooner.