Ok so my ovulation cycle ended the 18th. My husband and I had sex on the 16th. I've been off bc for one cycle only prior and had a full period on time that month. Well my period was due 4 days ago but instead of having it, I had light bleeding that lasted about an hour one day before It was supposed to start, then pink spotting for two days after that. Still no period and today was to be my last day. All preg test say negative. My question is, could inplantation bleeding come that late ? One day before my period is to start? If so when would I be able to see a positive result? We are not trying to conceive.