please answer this?!

hi everyone right now im waiting for my boyfriend to come back from walmart with one of the 88¢ pregnancy tests. and i was wondering when i should test. we BD on the 18th 19th 20th and 25th and i ovulated on the 24th. i just got done with what i believe to be implantation bleeding. it started on the 30th and lasted till today. it was light and the color was brown. and i'm on cycle day 27 my period isn't supposed to start till the 3rd(well that's what Glow has predicted). so i guess my question is when would the best day to test be?