Is 21 days enought time to take a pregnancy test after unprotectrd sex? i have very irregular periods so can't go by that?

Yes: But usually, it is more prudent to wait until you miss your period, as if your period comes, than you would not be pregnant. best wishes.

Yes: 21 days after sexual intercourse is enough time to obtain an accurate pregnancy test reading. Take care.

Yes: If you mean you are 21 days late, a pregnancy test should be positive. Irregular cycles? How irregular? You should see your doctor.