AF or implantation?

Gabby.
I've had some mild cramps the last couple of days. So mild they're just barely noticeable, and today I'm just feeling kind of off. AF is due 10/6. I've only had cramping the day before and day of AF in the past so now I'm a little thrown off. I'm 8dpo, I ovulated on CD15 and I'm on CD23 today. Any thoughts?