How soon after implantation bleeding finishes can you test with a first response ER

july

I think I’ve just had implantation bleeding this morning it was just a bit of pink discharge when I checked my cervix

Nothing since even though I’ve been checking up there ever since

Any way I’m DYING to know if it was and was wondering what’s the soonest after that you have even got a faint line with a first response early results test?