Should I even bother testing again?

I was suppose to start friday, the 17th. 
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I took a test saturday, the 18th, with top brand (snucks brand) blue dye. It was neg. 
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I took the second (same brand as above) the morning on the 19th. It was also negitive. 
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Still not starting, i took the third test in the box that test 1/2 came in (blue dye/top brand/snucks brand) around 4:30 today (the 20th) and it was neg. 
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Been having cramps, anxiety. 
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Should i even test again using a first responce since i've had 3 neg the past three days and they were all taken either afternoon ormorning time amd taken after period was no show.  

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