Spotting/implantation

Okay so my period is always regular. It was passed by 5 days and I decided to take a test and it was very faint. And I was experiencing a lot of the symptoms already, then I started spotting for a few days, (I think it’s implantation) and took another test while I was spotting and it was still very faint. I’d technically be 21 dpo today. I feel like the lines should have progressed already, I don’t know if maybe I ovulated late and maybe it’s still early to show a lot of hcg. I’m just curious if anyone else experienced something like this. I don’t know if it’s just gonna result in a loss.