Should I test again

So I took 4 pregnancy test 3 blue one pink. They were all negative except my last blue one which I took on the last day in a course of 4 days but it was a very faint line. My periods are very irregular so I based the test off of the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> app. Should I test again?

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