Abstract: The association between progesterone serum levels on the day of hCG administration and IVF pregnancy outcomes has been the subject of numerous studies and clinical investigations. We aim to conduct a systematic review and meta-analysis to explore the influence of progesterone serum levels on hCG trigger day on pregnancy outcomes in vitro fertilization (IVF) cycles. Through a comprehensive search of the PubMed and Embase databases, eight studies were identified for inclusion. The analysis revealed a risk ratio for live birth rate of 0.91 (95% CI 0.79-1.06), clinical pregnancy rate of 1.01 (95% CI 0.89-1.15), miscarriage rate: 0.98 (95% CI 0.80-1.21), implantation rate 0.81 (95% CI 0.49-1.35), and mean difference for endometrial thickness -0.01 (95% CI -0.16, 0.14). This study showed insignificant progesterone serum levels on the day of hCG administration and IVF pregnancy outcomes. However, the heterogeneity across studies emphasizes the need for larger, standardized investigations to elucidate the nuanced associations between progesterone levels and IVF success. This study contributes to our understanding of the role of progesterone in IVF outcomes and provides a basis for future research to optimize fertility treatment protocols.