In the 2nd edition of Reptile Medicine and Surgery 2nd ed by Douglas R Mader (vet reference) it says probing should not be done on iguanas and many lizards. And at that age the person's vet should have been able to say if the iguana is male or female. But
Link: Green Iguana Society: Green Iguana Anatomy
Link: Green Iguana Society: Sexing Green Iguanas
Egg binding occurs in bred and non bred females. It happens mostly because they are not given a proper nesting box, proper prenatal care or their health in general is not good.
Link: Melissa Kaplan's Green Iguana Care Collection: Green Iguana: Preparing for Egg Development, Laying and Incubation And why incubating fertile green iguana eggs isn't necessarily a good idea
Link: Melissa Kaplan's Green Iguana Care Collection: Dystocia in Reptiles
Egg-Binding / Fetal Retention
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Marie
Poyner Corner