Should the test already be showing?

Shell
Okay so.. I normally start about the third week of each month. My last period started 1.21.17.. well here it is 3.10.17 and I still haven't started. The only time I have had sex was 2.18.17 a couple days before my missed period. I've tried clear blue digital, first response, and the dollar pregnancy test all were negative except a couple lines after the pee dried. I've had no signs of my period about to start either. The app says I'm about 20 days late. Should a test be showing if I was? 

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