I’m so confused need advice

So I took a test on 7/17 and it showed a very very very faint line. And then I re tested today 7/21. And I still got a faint line. I can’t tell if it’s darker than the last one or the same. I have no idea when my period is due since I haven’t had one since I had my son 9 months ago.. Should the line be a lot darker by now? Or is it just indents?