Is it possible to implant at 4dpo?!

I never getting spotting and it seems I just had a tiny bit at 4dpo?! I could be maybe 5/6 dpo my opks were crazy this month and I never got a definite positive I just had LOADS of ewcm from 17-23 and lots of cramping on 22nd and 23rd, I was presuming I O’d on the 23rd but it could have been from the 20th as I had lots of my usual ovulating symptoms around then 🤷‍♀️🤔 anyway does this look like it could be implantation spotting?! I never got it with my first! Thanks ladies 😘