Very faint control line??

I called first response customer service to try to get an answer about this, but the lady was really vague and just told me that two lines equals positive. I Have been taking tests every couple days for the past two weeks just because I’m paranoid like that LOL and for the first time the control line is barely showing up and the test line is super dark. I know this sounds really unlikely, but what if the lines are somehow switched or put in upside down or something in the test itself? Has this happened to anyone else?