No period

Okay so as many of us are on here I'm TTC and my period hasn't come. My last started on Feb.19. And it still hasn't come. I don't even feel like it's going to. I've taken two tests. Both were at home pee tests. And both were negative. I have also been taking prenatals. Is there a chance I'm pregnant and just one of those odd cases where it just won't show up on a pee test.  What should I do? I took the tests the same week as my pissed period. I took the other on April fools day (because I thought it was funny). 

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