implantation bleed or AF??

Hi ladies, just looking for a bit of advice really. With my last pregnancy the first test i did showed a really really faint positive, this was 3days before af was due. the following day it was even fainter to the point i though the positive must have been a false pos. i stated to bleed that afternoon, my periods are always quite light anyway and only really last 3-4days. this appeared to be no different. so after that we juat carried on ttc. About week later i tested again and got a really strong positive so it turned out that the previous 'af' was infact implantation. unfortunately i miscarried at 12 weeks with this pregnancy. however a similar thing has happened again!! I tested 3days ago and got a really faint pos, tested the next day and nothing!! Today 'af' has started. it is a week early but i have all the usual cramps as i did the last time so appears to be af but im always regular! Could this be implantation again?? I had cramps last time.which is why i just assumed it was af and continued to try! I guess only time.will tell but has anyone else experience anything lile this? Implantation isnt supposed to be assosciated with any sort of pain but it was for me last time!! Any experiences, advice greatly appreciated! Xxx