It's been ten days since my period but there are faint lines on the test

Girls, I’m seriously about to lose my mind. Normally, I never miss, but it’s been ten days and nothing at all. I just took a test, but the second line is so faint that I can't even tell if it’s there or not. Honestly, I’m not ready for this at all; we were being careful, but is there anyone among you who has gone through something like this? Will it become clearer later or am I just overthinking it? Please give me some advice.