Multiple studies presented at the European Society of Human Reproduction and Embryology (ESHRE) meeting revealed novel biomarkers and risk factors affecting pregnancy outcomes. Research identified a simple first-trimester blood test predicting preeclampsia months before symptom onset. Another study linked paternal age to increased miscarriage risk and reduced live birth rates in donor egg IVF cycles. Additional findings associated gut microbiota imbalances and amino acid profiles with miscarriage risk in women with PCOS, underscoring the complex biochemical and paternal factors influencing reproductive success.