How Long Do Implantation Cramps Last?

Implantation cramping, which occurs as the uterine mucous membrane melts around the place of implantation, happens as early as a week after ovulation and generally ceases in a few days, states Babies Online. Implantation cramps occur once or over the course of a few days, though some women experience none.

Because implantation cramps are associated with the fertilized egg attaching to the uterine wall, these initial cramps only last a few days, explains Cramping after the initial implantation is generally associated with stretching of the uterus and surrounding muscles that support the growing baby. Such cramps are sometimes experienced throughout a pregnancy as the stretching continues. Report extreme or persistent cramps to a doctor to be sure that they are not a sign of illness.