3 day period ??

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So my period was a week late due to my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> i just started 2 days ago and now the 3rd day im already off is this anything to worry about? I am scared i may be pregnant but i dont think so just because i did bleed for atleast 3 days