This literature review examines the balance between microbial exposures and immune interactions in reproductive health, focusing on gametogenesis and embryo development. It discusses how microbes affect reproductive tissues, entry pathways, and impacts on spermatogenesis and oogenesis. The review also explores microbial interference with gamete development and early embryogenesis, emphasizing the immune system’s role, including cytokines and immune cells. It integrates case studies and clinical evidence to highlight the complex interactions between microbes and immune responses, discussing implications for fertility and pregnancy outcomes. Current interventions and gaps in knowledge are reviewed, aiming to improve reproductive health by managing microbial and immune factors.