What’s the latest DPO you can test before assuming you’re not pregnant ?

I’d say if you don’t have a positive by 12 DPO, the chances are slim. 14 DPO the latest.

Exactly the same boat, and for some reason, really thought I was and am now feeling quite sure I am not. That said, last time I was also extremely sure I wasn’t after a negative test, and was very much wrong.

Not out until your period arrives as its a positive test only occurs 1-2 days after implantation has occurred.

The very latest could be 17/18dpo.

Implantation happens between 6-12dpo, takes 1-3 days, and a further 1-3 days for hCG to rise enough to be detected on an early detection test.

So assuming you implant on 12dpo, it takes the full 3 days to complete that brings you to 15dpo, and then takes another 3 full days for hCG to rise enough to show as early positive that brings you to 18dpo.

It's less likely the further along you get but it's the reason they say that you're not out until AF arrives xx