bfp not getting darker

Claire
I fear I may be having a chemical pregnancy. 3 days ago I got a faint bfp at 10 dpo. I took a test this morning and it's still super faint. With my last pregnancy it was super dark at 12dpo. The weird thing is I have the terrible taste in my mouth that I had throughout my whole pregnancy. So now I'm confused and can only wait until tomorrow to test again.