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Objective: To evaluate the effects of early pregnancy loss on subsequent health care use and costs. Data Sources: Linked administrative health databases from Manitoba, Canada. Study Design: This was a population-based cohort study. The exposure of interest was first recorded ectopic pregnancy or miscarriage (EPM). Outcomes included visits to all ambulatory care providers, family physicians (FPs), specialists, and hospitals, as well as the costs associated with these visits. We also assessed the impact of EPM on a global measure of health service utilization and the incidence and costs of psychotropic medications. Data Collection/Extraction Methods: We identified women who experienced their first recorded loss (EPM) from 2003-2012 and created a propensity score model to match these women to women who experienced a live birth, with outcome measures available through 31 December 2014. We used a difference in differences approach with multivariable negative binomial models and generalized estimating equations (GEE) to assess the impact of EPM on the aforementioned health care utilization indicators. Principal Findings: EPM was associated with a short-term increase in visits to, and costs associated with, certain ambulatory care providers. These findings were driven in large part by increased visits/costs to FPs (rate difference [RD]: $19.92 [95% CI: $16.33, $23.51]) and obstetrician-gynecologists (OB-GYNs) (RD $9.41 [95% CI: $8.42, $10.40]) in the year immediately following the loss, excluding care associated with the loss itself. We also detected an increase in hospital stays and costs and a decrease in the use of psychotropic medications relative to matched controls. Conclusion: Pregnancy loss may lead to subsequent increases in certain types of health care utilization. While the absolute costs associated with post-EPM care are relatively small, the observed patterns of service utilization are informative for providers and policy makers seeking to support women following a loss. KEYWORDS early pregnancy loss, ectopic pregnancy, health care costs, health services, miscarriage, propensity score What is known on this topic * Pregnancy loss is a common event, occurring in up to a quarter of known pregnancies. * The impacts on women who experience a loss are not systematically understood, particularly their resulting physical and mental health needs and their use of related health care services. What this study adds * We evaluated the effects of ectopic pregnancy or miscarriage (EPM) on subsequent health care use and costs. * Our findings suggest an increase in utilization following an EPM (compared to women with a live birth) and a corresponding increase in costs, particularly for OB/GYN visits and hospitalizations. * Understanding the impact of EPM on subsequent health care use will allow providers and health systems to improve the patient-centeredness and appropriateness of the care they provide., 1 | INTRODUCTION Pregnancy loss is a common event, affecting up to a quarter of recognized pregnancies. (1) Most of these losses-including the majority of miscarriages (loss of a fetus [...]