Does there have to be a horizontal line in the result window to be negative or can a single verticle line be negative as well?

Does a negative have to be a horizontal ine or can a single verticle line be negative too?

There are 100s of different tests, can you give us the brand and type.

Also each normally have very clear instructions on the box, did you read the box?

There are 100s of different tests, can you give us the brand and type.

Also each normally have very clear instructions on the box, did you read the box?
Rexall One Step
Yes I read the paperwork but it doesn't say if a verticle line means pregnant I had one verticle line in the results round circle & one verticle in the oval window

I had unprotected sex on Tuesday 17/9/13. Can I detect if I'm pregnant?