Implantation question....please help

I have a question (might be a little bit silly)

I’m pregnant and I’m only 13 DPO. I got my BFP on 11DPO.

Does this mean the egg has implanted. I’m reading so many horror stories about 50% of eggs not implanting. I’m pretty sure though I have implanted as I have received a positive pregnancy test

Can anyone put my mind at rest??

Thank you