catch, v.² — Green’s Dictionary of Slang

catch v.²

to become pregnant.

1907		Wright EDD.
1927		Anecdota Americana 78: ‘How is it,’ he asked, ‘your wife never gets caught, while my wife has a child every year?’.
1936		J.T. Farrell A World I Never Made [no text] [Simes:DLSS].
1949		Monteleone Criminal Sl. (rev. edn).
1953		Randolph & Wilson Down in the Holler 114: If no women are about, a hillman may remark to a comparative stranger that his wife is ketched.
1973		L. Horner Mistress Falconhurst (1975) 16: ‘He bin here three months now, a-goin’ it every night; Letty ain’ cotched yet but Hattie she already cotched, so she say’ [Simes:DLSS].

get catch (v.) (also get ketch)

(W.I.) of an unmarried girl or woman, to become pregnant.

1996