When can implantation bleeding start? AF is due on the 5th. In the past though I have normally got pink/red discharge a day or two early only very small and it’s gotten heavier from there. I wiped last night (it’s now morning) and was certain a little bit was very light pink, nothing like before, nothing clot like to think it’s period and my breasts look like balloons and feel so heavy! Could it be implantation bleeding now or is it too soon? When should I test?