When can i test?

With my first daughter, I do not remember when I took my pregnancy test. With my last daughter, I took my first test a week early I got a negative. 11 days after my missed period I took another test and got a positive. I am three days go late on my period, and just wondering when I should take a test. My period has been on point to the T exactly 28 days apart since January. Thanks in advance ladies :-)