For those that had implantation bleeding, what was it like for you? Is it similar to AF spotting or is it completely different? Do you see it when you wipe?

AF is due in a few days and today I noticed some spotting when I wiped. I usually spot for a two days before the full flow but this is slightly early. My body could be out of whack though because I had an CP last month and a miscarriage the month before. Anyway, I'm pretty sure I'm out this month but I guess I'm just hoping it's implantation bleeding instead of AF. Wishful thinking?