IF you do get implantation bleeding, its usually like a super light af but its pink to brownish blood and not the bright red "new" blood. It also typically happens between 5-10dpo. If you are going to have an early af, its not likely to have it happen more than a couple days before expected. And it will be more obvious thats its af because you will have a full flow and not just a bit of spotting. However you can implant without any bleeding, not everyone experiences that. Often if you do implant you can feel soreness in the abdomin etc, but again not everyone will experience it.