Implantation bleeding or not? Looking for insight!

Okay so I’m just so confused at this point. My first two pregnancies I had implantation bleeding between 6-8dpo and then within a day or two had a positive test. I started spotting this past Saturday and it lasted until Sunday night and it’s now Tuesday and spotting has been completely gone and I feel off and I still don’t have a positive test. I just figured I should by now based off past pregnancies! Period due this coming Saturday. Anyone have experience with this or with it taking longer to get a positive or just have random spotting in between periods in general that had no correlation to pregnancy? Thanks!