Normal or chemical?

Rita

I’m not sure what’s going on. I’ve been getting faint positives since 8dpo. Yesterday at 9dpo it was a lot lighter so I assumed it was a chemical and then today it’s darker. Has this happened to anyone else? Did you have a good outcome? I know hcg doubles every 48h but my 8dpo and 10dpo don’t look much different

8dpo

9dpo (almost nonexistent)

10dpo