Is there a test for mild dyslexia? How would one know for sure? Should I care? I doesn't bother me much other than people thinking I have terrible grammar and reading comprehension skills.
One other thing that is very common for me, but I'm not sure if it is related to dyslexia or not, is that I will frequently either forget the next word I was about to say or say the wrong word without noticing. An example of the latter would be if I am filling the dishwasher I'll say that I finished the laundry, or I'll refer to shaving in the morning as mowing. These happen to me on an almost daily basis.
I was told that there is no diagnostic test for dyslexia. All they can do is survey your symptoms and test your reading speed and comprehension (in addition to executive function, working memory, and verbal IQ for cross-reference).
So if you have those symptoms, you probably are dyslexic. There's no real point in seeking a formal diagnosis unless you feel that it would benefit you to have it documented (e.g. if you're a student and need extra time to finish exams or so).
Should you care?
I'm not sure, you can look into tools that are recommended for dyslexic people (a spellings corrector is probably the single biggest thing), but you can try those without actually knowing if you are...
If you are a student then your school may provide special facilities for you. Other then that I can't think of a reason to care, besides satisfying a curiosity.