What dpo did you get a positive on a digital?

My boyfriends skeptical after our miscarriage in september. I’ve had faint but visible lines on 4 different pregnancy tests today and yesterday, this morning I took a Clear Blue ultra early digital (the one with the red stop light) and it’s saying Not pregnant. Slightly frustrating, as i can see lines on all my other tests, and I know he just wants to see it in words! I think I’m about 10dpo today. I’d like to buy the weeks indicator tests but I know they take even more HCG to come up positive.