I tested when the implantation bleeding started (about 3-4 days)... Which was 3wks and 3days after my last period. It was one of the early response tests and came back + pretty quickly.
I should add that my cycles are usually only 3 wks anyway so this put me at being "due" for my period. Which is why I did the UPT after the 3rd or 4th day, my periods are never that light for that long.
I am going through something similar. This is only my first month being off the pill and this week would normally be when my period comes. Obviously I have no idea if I will be regular or not having just gone off the pill but I noticed the slightest tinge today and I am not sure if it's implantation bleeding or if I am going to get my period this week. I think I'll wait until the weekend to test (if I don't get my period of course!) good luck to you!!!
Re: Implantation Bleeding and BFP