VVFL, husband doesn’t believe... how many DPO can a doctors test confirm?

Lo

I got a a vvvfl on a home test strip today.

I’m currently 12dpo and a bit under 2 days away from Aunt Flo’s scheduled visit.

I’m trying to convince the husband that what I have is a positive even though it’s a faint line. (I’m using easy @ home strips, but in japan pretty much every test I have ever seen sold here don’t allow early detection, so he is probably hesitant partially because of that)

I think he isn’t meaning to be negative, but I feel like he is being a little over cautious, I feel like if I go to the doctors and get the doctors to test it would be easy to confirm but he still thinks it’s too early.

So my questions is

From how many DPO will a doctor be able to do a test and get positive results?