When to test after implantation?

I am actually also trying to get an answer to this question. About 7 days I noticed just a very slight bit of spotting when I wiped so I thought "ok, I'm starting" well, that was it. No period, no more spotting. I did however experience some cramping and clear sticky discharge last week also.

I'm not sure when I should test though. Any suggestions? (I know most people say wait until your missed period. Well, I stopped Birth Control Feb 8th and have not had a cycle since. My original pregnancy test at 1 week late was negative. I'm thinking I might have ovulated past the date of my missed period and gotten pregnant since then. .)