The most significant factor is one’s age. The older a woman is, the less likely she is to become pregnant. Females above the age of 44 have a very slim likelihood of becoming pregnant. The ovaries and fallopian tubes are influenced by previously experienced sexually transmitted diseases and infections, which reduce the chances of pregnancy. IVF success is influenced by sperm quality, embryo adhesion in the womb, complications such as myoma or polyp, and blocked fallopian tubes, among other things.