Indents or positve?

I can see lines on the cheapies,wondfo and easy at home and the Walmart cheapie but barely a line on frer...so don't know which to trust. I taught frer was the best out there. What you ladies think..2 weeks faint positive getting darker at snails pace but no line progression on frer. The just started to appear at 2 mins on frer but not change in darkness. But I see changes on the others.