Anyone experienced implantation bleeding?

I had sex 31st Dec (twice) and 1st Jan (once). I ovulated on 2nd January and today I got this.

I’m not due my period for another 4 days. Has anyone experienced implantation bleeding? Does it look like this? I can’t remember if I did with my first born as she wasn’t planned so I wasn’t looking out for signs then 🙈

I know the next few days will tell but just wondered if it looked similar to anyone else’s experience. Thank you 😊