Figure 1 A. Association ROC Curve between progesterone (P4) serum assessment values and pregnancy B. ROC curve of association between pregnancy and serum dosage of P4 in cycles with antagonist regardless of progesterone for luteal phase support C. ROC curve of association between pregnancy and serum dosage of P4 in cycles with antagonist and injectable progesterone use D. ROC curve of association between pregnancy and serum dosage of p4 in cycles without any blockage.