Best test

What brand do you recommend for testing early? I got a faint positive immediately  yesterday but today I got a negative this morning. I'm testing really early, like my period isn't due till next Friday, but I'm anxious to keep testing to see if maybe my urine was just too diluted this morning. 
If I buy more tests do you have any recommendations? I was using the FRER curved ones, which I know some ppl have gotten false negatives from. Help!

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