Implantation cramping

Michelle? • I have a 3 year old son and just got my bfp for baby #2!!!❤️❤️❤️
I thought I felt what may have been implantation cramping about 2 days ago it was on the left side and would go down into my leg. Nothing horrible but I definitely felt it. But then today I was ganna some cramps just down low in my abdominal. Could this still be implantation cramping or AF (due nov 12) anyone know how long implantation cramps can last?