John H. Walton et al. provide interpretation of Numbers 5:27; potentially an induced miscarriage.
John H. Walton, Victor H. Matthews, Mark W. Chavalas, The IVP Bible Background Commentary: Old Testament (Downers Grove, IL: InterVarsity Press, 2000), 145-146
5:27. the negative potential results. Suggestions have ranged from a flooded uterus to false pregnancy to pelvic prolapse to atrophied genitalia. Whatever the actual physical manifestations might be, the text clearly indicates that the result is sterility. If the woman had been brought into this process because of pregnancy, it may be that the potion would be expected to induce a miscarriage in the case that the pregnancy came about through illicit behavior.