Is implantation bleeding after a BFP ok?? 11 DPO

Hello! I recently got my bfp (pictured below) at 10 dpo. We are over the moon! I had what I thought were implantation cramps/twinges at 6/7 dpo and got a vfl at 9 DPO.

Well today I’m 11 dpo and my line has gotten a little dark. This morning, after a BM (sorry tmi), I went to wipe and there was light brown on the toilet paper (along with a lot of CM). Could this be blood from implantation a few days ago? I’m worried i might be having a chemical pregnancy. I haven’t experienced any bleeding since.

Thanks!