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Pregnancy interventions represent key avenues for preventing non-communicable diseases, which, collectively, constitute a major global public health challenge. Evidence syntheses indicate that probiotic interventions, while effective in managing some pregnancy complications, do not confer health benefits to otherwise-uncomplicated pregnancies. Yet, messaging around probiotics in pregnancy is mixed, such that pregnant people may feel pressure to spend limited resources on (costly) probiotics. To tailor knowledge exchange and support safe, equitable access to pregnancy probiotics when their prescription may be warranted, we need to understand who takes probiotics during pregnancy and under what conditions.We used chi-square and logistic regression analyses of anonymous, cross-sectional survey data from 340 pregnant Canadians of diverse socio-demographic backgrounds to assess which respondents, by socio-demographic characteristics and pre-pregnancy/pregnancy health indicators, were relatively likely to: perceive probiotics as beneficial to pregnancy health and/or report taking probiotics during pregnancy. Forty-seven percent of respondents perceived probiotics as beneficial to pregnancy health; 51% reported consuming them. Probiotic attitudes and consumption were strongly socio-demographically-patterned, with higher-income, post-secondary-educated respondents disproportionately perceiving probiotics as healthy and taking them. There was no evidence of variation in probiotics attitudes or use by health indicators.Socio-economic factors may be more important determinants of pregnancy probiotic use in this sample than indications for pregnancy complications. We highlight the need to establish clear guidelines on pregnancy probiotics that reflect current evidence. We also call for facilitation of equitable access to probiotics for pregnant people when probiotics are likely to confer health benefits, to support long-term health and health equity.