Sperm can live for about five days inside the uterus, so providing those two time frames collide, it can be pretty soon after sex. Hours, usually. Implantation occurs between 6 - 12 days. Different sources say different things, but it seems to be no fewer than six days and no longer than fourteen.
In short, it soon became apparent that a new stage of life â the teenage phase â was becoming a reality in America. American adolescents were displaying traits unknown among children and adults. Although the word teenager did not come into use until decades later, the teenage mindset dawned in the 1920s.
Meaning childish adult person is from c.1600. Meaning youngest of a group is from 1897. As a term of endearment for one's lover it is attested perhaps as early as 1839, certainly by 1901; its popularity perhaps boosted by baby vamp a popular girl, student slang from c.1922. As an adjective, by 1750.