Everyone's resting hcg is different so it's hard to tell how quickly t would rise high enough for a positive result.
I personally didn't get a strong noticeable bfp til I was 17dpo so three days after af was due.
When is you af due? X
i would leave it a week (if you can!) and test again if AF doesn't show up. I know very little about the implant so not sure how long it takes to come out of your system, but say you ovulated a week after it was removed + 6-10 days til implantation and 48-72 hours for hcg to be high enough in your blood stream