Super light?

Hi- I’m sorry if this is not the right group, I just needed some opinions. I know that I see a + (😍😍!!) but why is it so light?? Tomorrow is when I’m supposed to start my period, and this is with FMU. Could this be a chemical? I don’t feel pregnant and I’m worried the line is so light. With my son, I felt pregnant and maybe I used a different test, but I know the line was darker.

Again, sorry if it’s not the right group, but please if you can share your opinion?

Thank you!