What is this!?!

I have had this for a few days now, its never been heavier than this, just spotting and is always a pinky/brown colour.

It’s not my period because i’m not due for another 10 days

I had unprotected sex 3 times within my fertile window (which eve showed was 7 days...) however only at the very beginning did my partner cum inside me which makes me wonder if this could be implantation bleeding as I first noticed the spotting around my last day of my fertile window.

I don’t have any other early pregnancy symptoms

Advice/ opinions please!!!