Implantation?

I’m 11dpo.

Yesterday I had two dark bloody discharge. I thought I was out for sure. But, today it’s been one dark blood discharge and then a clear/light yellow. What is happening in there? Pregnancy test is negative but if implantation is happening then that makes since, but, if it’s a period, that also makes since 🤷‍♀️

Implantation? Period? I’ve never had implantation bleeding before. Does it start like this?