Little advice needed

Hi all, a little advice needed, I started bleeding Monday around teatime…. But was only when I wiped I put a pad on and it was empty until bed, I got up yesterday and there was around a table spoon worth of blood there…. Again when I wipe there’s a bit of blood, and all day yesterday my pad almost empty….my question is, how long can implantation bleeding last? What colour is it? And does it happen around the time your due on period? I’ve had a few light cramps in my tummy and light belly ache… any advice appreciated ♥️