3weeks late on period all negative pregnancy test

Dominique
Hello my period is 3 weeks late my last period start date was March 13th I normally get 2 periods in one month always have. I keep taking pregnancy test they are the cheap ones that's a dollor and they keep coming back negative idk what this mean or what should I do should I ignore it and wait to see if my period comes by May or schedule to see a obgyn 

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