Veronica I always naughty and tested early and always get really disappointed when I got the BFN. I would wait until AF is due and test that morning. It could potentially save you the disappointment of an early negative.
But as for your message worrying about an implantation dip don't. I didn't get an implantation dip or implantation bleed and my temperature didn't even stay up.
So what i'm trying to say is hang in there keep those positive thoughts coming and catch all the baby dust i'm sending you.
Good luck and i'll be shalking you to see what happens.