Really light period but bad pains?

Hi all,

I’m really concerned as I’ve had bad cramps yesterday and today, but only started bleeding today (4 days after period was due) and it was SO light. The blood itself is pale pink if anything when I wipe, and there’s hardly anything on the pad. I’ve googled and it says it’s implantation bleeding, but I have the coil and will honestly KMS if I’m pregnant (I’ve had 2 abortions already in my life and have begged for a sterilisation because the unwanted pregnancies were unbearable - but they wouldn’t let me because of my age). Please can anyone reassure me that there’s another reason for such light bleeding with heavy pains that isn’t pregnancy 😭😭😭