Which pregnancy test do you think is the most accurate?

Please tell me which pregnancy test do you think is the most accurate? I took a First Response Gold test today because it says you can test 6 days before your missed period. I'm not suppose to get my period for a few days and it came up negative. My last pregnancy I waited one week after missing my period to test and it came up positive. So now I'm not sure how accurate this test is since I haven't missed my period. Do you think there's a chance I could be pregnant? Should I try a different test?