Is this normal???

Is this normal? I recently started testing on the 29th of September (Last AF was 25th of September). The strips were showing 2 lines, of course, one line more faint than the other. Now the other line is disappearing

and I'm supposedly starting my fertile week tomorrow. Is it going to start showing the other line again? I thought it was supposed to progress not disappear. I'm new at this. I've been tracking my bbt too, also new at that. I never thought getting pregnant would be this hard! I'm only 34.