I understand your panic @Hall24 I've been there myself with an early loss at 6 weeks where the tests never progressed, followed by a MMC, followed by a 19 week loss of my son. I really sympathise know the longing and the heartbreak.
Implantation bleeding happens 2-3 days before a positive test as it's the blastocyst embedding in the womb. It's after it takes 48 hours after implantation/spotting for HCG to show up. However, it is quite normal to spot in early pregnancy, so if you've ovulated late and it doesn't progress to full on period heaviness, it could be okay.
The Clearblue in negative. There might be a faint line on it in person, but if it's not visible on a camera at all and you have to squint to see it in person, it's best to consider it a negative as there's no 'maybe' option with them. The ones with the cross aren't early response, they're designed for after a missed period, and they're also well known for evaps, so I wouldn't trust it, sadly,
I do see the positives clearly on the easy@homes. It's always hard to tell with these when they first pick up HCG whether they're positive or evaps unless the line is strong and pink immediately. The only way to know is either throw the tests away and wait for AF to be late, then test again afterwards, or test in 48 hours to check for progression. The best way to confirm is to use two different brands of early detection pink dye tests, or a FRER, because Clearblue can't really be trusted when it comes to faint or incomplete lines like this.
As difficult and as upsetting as it is, anyone who has had a loss has to come to terms with it being out of our control. No amount of stressing will change the outcome. It's really hard to accept and totally understand wanting to do all you possibly can to prevent it, but whatever happens, it's not your fault. Be really kind to yourself.
Try to give yourself 48 hours and test again. You'll have your answer for certain then, and I have absolutely everything crossed that it's a lovely, positive one ❤️