Hi, just wondered if anyone knew what the lasest day implantation takes place. My cycle is normally 34-35 days but on the odd one now and again its been 30-32 days. Im on cd29 today and had sex on cd16. Ive got very tender boobs, more than i normally have before af and today i have got painful cramping which i dont normally get, when i went to the toilet earlier and wiped , there was a small stain of very pale pink on the tissue, i just wondered whether this could be implantation this late or if af is on its way.