How early can I take a pregnancy test when my period is still irregular?

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So I had sex last Friday, and this Friday, unprotected. And I want to take a home pregnancy test but I’ve heard that you need to wait until some point after your first missed period.
The thing is, my period is still irregular sometimes… so when should I take it? I mean, there’s an estimated time when I usually get it, but sometimes it’s not the same.
So when should I take it?

there is a test, i forgot the name, but you can take it even before you missed your period.
and it gives you true results.
i will edit when i find the name
Wait up to two weeks!
When you feel the urge to pee
you have to wait least 4week good luck
at least 2 weeks after the date in question.
About 3 weeks.