well like you know i am waiting for af today i never never being late before . On Sunday night i had a CM discharge brownish once and than on monday i had it in the morning but more pink like clear discharge with a light pink color and than yesterday again more brownish but really only when i wiped ...i was not having big cramps but very light cramps and it was not one specific location more like on the side than on the middle i could not tell really i was not confortable for sure specially on monday . Today this morning only clear discharge and because i had the discharges on monday and tuesday i was so sure that AF will show up today or by lunch (i usually have than in mid day) i am still waiting ...keep in mind that my cycle is 26 days only so if i had implantation bleeding may be it is ...i don't know ! my last AF were 0ctober 7th ,Nov 1,Nov 26th ,Dec 21 that why i consider myself regular.
hope you having you implatation...it is suppose to happen anywhere from 6dpo to 15dpo! depending how long your cycle last.