Vfl with one step pregnancy strip?

Gabrielle

What’s everyone’s experience with the one step pregnancy tests?

I’m currently 13dpo, period due tomorrow. Took a test this morning with fmu got a vfl, pictures posted below.

I then have done a frer and it looks negative to me, also pictured below.

So I don’t know whether it’s because the second test wasn’t with fmu or whether there’s a chance the one step is wrong?

Please help!!