Asking for my sister!

Hi ladies. I’m asking a few questions for my sister who doesn’t have this app but needs some advice (neither of us are moms so I can’t help her with this).

She took a few tests on Thursday last week and they were positive. Yesterday and today she took two more each (the easy@home hcg strip ones). She said the ones yesterday and today are a vvvvfl but after sitting for about 5 mins, the line got a little darker so now she can kinda see it but it’s still not a bfp. I asked her for a picture of them but the lines are so faint you can’t see them in pictures. This leads to her questions:

1. Is it possible for them to still be positive?

2. Do all tests turn positive after sitting out past the time frame listed on the box?

3. If the lines were clearly positive on Thursday (not quite bfp but still noticeable) and super light today, does that mean she’s probably miscarrying?

Thank you ladies for all your help! xx