Does a digital HPT class pregnancy from implantation or fertilisation?

? Kristina ? • ? I`m 23 & live in England ? TTC #1 ✨ Had a chemical pregnancy on 24/09/2014 ?
Sorry for the stupid question. I read that you can't get a positive pregnancy test before implantation and I use clearblue digital tests which indicate how many weeks pregnant I would be. Would the weeks start at fertilisation or implantation? Thanks :)

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