Calcium Carbonate on Labor Induction

Inclusion Criteria: * Adult laboring patients ( ≥ 18 years of age) * Able to speak and read English or Spanish (for historical cohort, preferred language should be English or Spanish) * Singleton gestation * Greater ≥ 37 weeks gestation in vertex presentation * Present for induction of labor inclusive of medical indication, elective indication at greater than 39 weeks gestation, trial of labor after cesarean * Receive standard-dose oxytocin during induction Exclusion Criteria: * Participants will be excluded from the study if they do not meet the above inclusion criteria or they will be further excluded under the following circumstances: * Known need for cesarean section prior to induction of labor * Known allergy to calcium carbonate * Known contraindication to taking calcium carbonate including renal calculus, high urine calcium levels, elevated serum calcium, low serum phosphate, achlorhydria, or suspected digoxin toxicity. * Inability to tolerate oral intake (i.e., nausea/vomiting) * Need to be nothing by mouth (NPO)