A method for selecting an oocyte that when fertilized produces a viable embryo with a high implantation rate leading to pregnancy: comprising a step of measuring in a cumulus cell surrounding said oocyte the expression level of the genes of groups A, B and C, wherein: - group A consists of phosphoenolpyruvate carboxykinase 1, ADP-ribosylarginine hydrolase (ADPRH), calcium binding protein 4 (CABP4), SLAM family member 6 (SLAMF6), calmodulin binding transcription activator 1 (CAMTA1), chondroitin sulfate proteoglycan 2 (CSPG2), and perforin 1, - group B consists of FBJ murine osteosarcoma viral oncogene homolog B (FOSB), neuroligin 2 (NLGN2), phosphodiesterase 5A, cGMP-specific (PDE5A), phospholipase A2, group V (PLA2G5), glypican 6, and early growth response 3, and - group C consists of nuclear factor I/B (NFIB), nuclear factor I/C (NFIC), insulin-like growth factor 1 receptor (IGF1R), G0/G1switch 2 (G0S2), glutamate receptor, ionotropic, kainate 5 (GRIK5) and RNA binding motif, single stranded interacting protein (RBMS1), - which further comprises a step consisting of comparing the expression level of the genes in the sample with a control, wherein: - overexpression of one or more genes selected from group A is predictive of an oocyte that when fertilized produces a viable embryo with a high implantation rate leading to pregnancy, - overexpression of one or more genes selected from group B is predictive of an oocyte that when fertilized does not produce a viable embryo with a high implantation rate leading to pregnancy, the embryo being unable to implant, - overexpression of one or more genes selected from group C is predictive of an oocyte that when fertilized does not produce a viable embryo with a high implantation rate leading to pregnancy due to early embryo arrest. comprising a step of measuring in a cumulus cell surrounding said oocyte the expression level of the genes of groups A, B and C, wherein: - group A consists of phosphoenolpyruvate carboxykinase 1, ADP-ribosylarginine hydrolase (ADPRH), calcium binding protein 4 (CABP4), SLAM family member 6 (SLAMF6), calmodulin binding transcription activator 1 (CAMTA1), chondroitin sulfate proteoglycan 2 (CSPG2), and perforin 1, - group B consists of FBJ murine osteosarcoma viral oncogene homolog B (FOSB), neuroligin 2 (NLGN2), phosphodiesterase 5A, cGMP-specific (PDE5A), phospholipase A2, group V (PLA2G5), glypican 6, and early growth response 3, and - group C consists of nuclear factor I/B (NFIB), nuclear factor I/C (NFIC), insulin-like growth factor 1 receptor (IGF1R), G0/G1switch 2 (G0S2), glutamate receptor, ionotropic, kainate 5 (GRIK5) and RNA binding motif, single stranded interacting protein (RBMS1), - group A consists of phosphoenolpyruvate carboxykinase 1, ADP-ribosylarginine hydrolase (ADPRH), calcium binding protein 4 (CABP4), SLAM family member 6 (SLAMF6), calmodulin binding transcription activator 1 (CAMTA1), chondroitin sulfate proteoglycan 2 (CSPG2), and perforin 1, - group B consists of FBJ murine osteosarcoma viral oncogene homolog B (FOSB), neuroligin 2 (NLGN2), phosphodiesterase 5A, cGMP-specific (PDE5A), phospholipase A2, group V (PLA2G5), glypican 6, and early growth response 3, and - group C consists of nuclear factor I/B (NFIB), nuclear factor I/C (NFIC), insulin-like growth factor 1 receptor (IGF1R), G0/G1switch 2 (G0S2), glutamate receptor, ionotropic, kainate 5 (GRIK5) and RNA binding motif, single stranded interacting protein (RBMS1), - which further comprises a step consisting of comparing the expression level of the genes in the sample with a control, wherein: - overexpression of one or more genes selected from group A is predictive of an oocyte that when fertilized produces a viable embryo with a high implantation rate leading to pregnancy, - overexpression of one or more genes selected from group B is predictive of an oocyte that when fertilized does not produce a viable embryo with a high implantation rate leading to pregnancy, the embryo being unable to implant, - overexpression of one or more genes selected from group C is predictive of an oocyte that when fertilized does not produce a viable embryo with a high implantation rate leading to pregnancy due to early embryo arrest. - overexpression of one or more genes selected from group A is predictive of an oocyte that when fertilized produces a viable embryo with a high implantation rate leading to pregnancy, - overexpression of one or more genes selected from group B is predictive of an oocyte that when fertilized does not produce a viable embryo with a high implantation rate leading to pregnancy, the embryo being unable to implant, - overexpression of one or more genes selected from group C is predictive of an oocyte that when fertilized does not produce a viable embryo with a high implantation rate leading to pregnancy due to early embryo arrest.