Before choosing a fertility clinic, you must know how to read and interpret official IVF pregnancy success records. Yearly data reporting pregnancy success by fertility clinics nationwide is a wealth of information for IVF patients. Here’s the deal: These reports help patients choose a fertility clinic and estimate their average chance of pregnancy success through IVF technology. Why is this important? A substantial amount of IVF pregnancy success is accomplished through Frozen Embryo Transfer (FET) procedures.