The tiny embryo is swept along a Fallopian tube to the womb (uterus) by tiny hairs (cilia).

http://www.patient.co.uk/health/ectopic-pregnancy-leaflet

A sperm may then combine with the ovum (fertilisation) to make an embryo. The tiny embryo is swept along a Fallopian tube to the womb (uterus) by tiny hairs (cilia). It normally attaches to the inside lining of the uterus and develops into a baby.