First Response Pregnancy Test Comparison

Kelsey
Morning All! Does anyone have any feedback on First Response Rapid Result versus First Response Early Result? 
Based on a few different calculators, AF is due for me sometime between tomorrow and Monday 2/27. I have been so anxious that I decided to test this morning because that was 1 day early if I am due tomorrow and 3 days if it's Monday. When I went to take the test I noticed I bought RAPID Result instead of EARLY Result. The box said that the rapid Result can only detect pregnancy on the day OF your missed period.  I took the test anyways and got a BFN :( 
Has anyone used the rapid result, tested negative but then tested positive with another? I know I am stretching myself here but I really thought this was the month!! 

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