Is this implantation bleeding?

Katie

Spotting started on the night of the 24th Oct and is still on going today.

- colour was a pink (on the 24th night till the 25th) then turned to a brownish colour.

- morning of the 25th woke up with the urge to get sick (didn’t).

- it has turned back to a light red colour, I’ve worn pads but there doesn’t be much on it at all it’s more when I wipe.

- been feeling sick, tired and have had headache with mild stomach pains.

IS THIS IMPLANTATION BLEEDING? AND WHEN SHOULD I TAKE A TEST?