If the follicles are mature and the eggs are retrieved, IVF can be done. If the follicles are not mature and the eggs are not retrieved, IVF cannot be done. Follicular monitoring reveals that if the two follicles can develop into normal size and mature follicles or develop into dominant follicles during ovulation, the embryos can be matched with sperm by retrieving suitable eggs, and if there are transferable embryos, they can be transferred to IVF. However, if the 2 follicles are underdeveloped and have not reached maturity, or if the follicles shrink in the middle of the process, or if no eggs are retrieved, then IVF cannot be performed. Specific cases should be carried out under the guidance of a doctor to confirm the treatment plan.