Cramping & Implantation, Should I Be Worried?

I’ve been having some light cramping for the past week or so, AF is in two days. I usually don’t cramp like this before my period. I haven’t bled until today, and it’s light like this. My period blood usually doesn’t look like this when it starts. Period or implantation? I’ve had some lower back pain & heart burn.

The light is yellow But it’s a light pink irl