Idiopathic purple thrombocytopenia is a hemorrhagic pathology, characterized by a decrease in the platelet count during pregnancy, mediated by cells and anti-platelet antibodies, causing the premature destruction of platelets by the reticuloendothelial system, which during pregnancy could lead to a commitment to maternal fetal wellbeing in severe stages. This pathology occurs in 1 out of every 1,000 to 10,000 pregnancies, and corresponds to 3% of thrombocytopenic pregnancies. The goal of management is to maintain platelet counts within safe ranges, recommending starting harmacological management when a platelet count lower than 10,000 / uL is found at any time during pregnancy or 30,000 / uL in the second or third trimester. The case presented corresponds to a 40-yearold woman in the first trimester of pregnancy with a history of chronic idiopathic purple thrombocytopenic, with severe thrombocytopenia at the time of admission to the Hospital. Keywords: Idiopathic thrombocytopenic purpura. Pregnancy. Blood platlets.