Three days late, should I test again?

K • ✨
Hey ladies!
I'm not very educated on when the right time to test is, other than when your period should come but I tested a few days ago (days 28) the day before my missed period, and got a negative. But now it's day 32, still not a spot of blood and I'm worried, should I test again or would it still be negative? Sorry for the stupid question! 

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