When does implantation bleeding occur & is it something you see for a week straight or just every other day ? does it also comes with cramps ?

Implantation ?'s: Implantation may cause mild bleeding, and occurs 5-6 days after unprotected intercourse. Bleeding from implantation is usually limited to 1-3 days. There are other causes for vaginal bleeding, so see your gyn physician for an exam if this continues. If your period is delayed, obtain a serum HCG test to be certain about pregnancy.