I'm nervous

He
I'm trying to work myself up to going to the doctor today to get a confirmation. My lines are still kind of faint and not getting much darker and I got a bfn on a digital. I've had two losses and Was told I need to start on progesterone asap the last time. I'm just nervous that I'll go there and they'll tell me it's a bfn. 
Oh and I'm right around 4 weeks. Af due today.