Objective: to report the case of a pregnant woman with antiphospholipid syndrome history, in whom coronary microvascular disease was documented. Antenatal medical treatment improved prognosis and maternal and perinatal outcomes. Case: multigravida woman, 29.6 weeks pregnant, diagnosed with acute coronary syndrome, referred from a first level hospital. Diagnostic workup revealed microvascular disease. After receiving adequate management, she was discharged from hospital and included in the high-risk pregnancy program. Results: the diagnosis was made based on echocardiography, electrocardiography, troponin levels and cardiac catheterization. Anti-ischemic therapy was indicated considering the risk-benefit trade-off; management with aspirin was continued and the baby was born healthy. Conclusions: coronary microvascular disease should be considered, as a differential diagnosis in a pregnant woman with chest pain and history of antiphospholipid syndrome. Patients benefit from receiving antiplatelet and anticoagulant therapy soon after the diagnosis is made. Studies are required to evaluate the safest and most effective management of this condition.