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?

Read the pregnancy test box, it should say on there. If it comes up negative wait a couple more days and see what it says again.
u can go to the doctor
two weeks after sex should show a pos if you are