Noun
an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
Source: WordNetAfter fertilization, the conceptus travels down the oviduct towards the uterus while continuing to divide O’Reilly, Deirdre. Source: Internet
On a well-known wooden picture is indicated: Goudæ conceptus, Roterodami natus (Latin: conceived in Gouda; born in Rotterdam). Source: Internet
During the early days of pregnancy, the conceptus is mobile, moving about in the uterus until about day 16 when "fixation" occurs. Source: Internet