Update: Took a test last night (12dpo) and it was negative... didn't feel down about it as i wasn't expecting it to be positive considering we've literally only just started trying. I went to take a shower, came back 15 mins later and my OH ran up to me saying that there's a positive line after he picked it up while I was showering. I saw the faint line when he showed it to me, but I'm thinking it's an evap line?? Not too sure, so I'm just waiting for this weekend (just 2 days) for AF to come and if it doesn't show up, I'll def have an answer.
Edited to add: I bought a pink dye test too, listened
@Cooksie's advice on not going for a blue one