IVF includes the following steps:
- Ovarian stimulation
- Egg retrieval and selection of suitable egg
- Fertilisation via ICSI (injection of single sperm to the egg) or other procedures
- Choosing the fertilised embryo
- Embryo transfer
- Luteal support of the corpus luteum
Any of these steps can go wrong and reduce the chances of conception. Age, BMI, lifestyle (e.g smoking), response to drugs, response of the womb to receive the embryo can also affect the chances. A healthy body, balanced diet and acupuncture can help improve chances as well.