Abstract: A novel class of steroids having pregnancy-terminating and/or pregnancy-preventing activity and a very low antiglucocorticoid activity have been found. The compounds have the general formula: ##STR1## wherein R.sub.1 and R.sub.2 each separately represent H or a (1-4 C) hydrocarbon radical or together represent a (2-6 C) hydrocarbon radical, R.sub.3 represents H or a (1-4 C) hydrocarbon radical, optionally having an OH substituent, R.sub.4 represents OH or an ester or ether group, or together with R.sub.3 represents O or a heterocyclic ring system containing O, and wherein the broken line indicates an optionally present double bond between the carbon atoms at positions 9 and 10 of the steroid skeleton.