How accurate are blue dye tests?

Krista

I’m only 11dpo but I’ve had period like cramps and aches for 2 days now (which is my one real symptom of my last pregnancy) so I decided to take a test I had at home. How reliable are the blue dye tests though? This is my first cycle trying after miscarrying in June (on Father’s Day, no less) so I don’t want to get my hopes up...