Does anyone no when implantation happens?

[blahblahblahX3]

Hello I've got a positive pregnancy test it's early and faint but I was just wundering wen implantation happens? I wanted to know if it has already happens or if it need to happen still?
My period is due any day over the next 3 days

It happens before you get a positive test.

If you have a positive pregnancy test then you are pregnant and therefore implantation has already occurred. You wouldn't get a positive result if implantation hadn't happened.

It begins to happen around 6dpo but won't show on a pregnancy test for another 4 days or so.

Thanx every1 I really appreciate it XxX