welcome to HCM.
I understand your concern as many drugs do interact and lead to newer diseases. However, endometriosis
is an enigmatic disease for the gynecologists even in this advanced era. The exact reason as to why it develops is not known. The risk factors like having a family history, or not having children only increase the chance of having endometriosis but it does not mean that other women will not develop this disease. Oral contraceptives like ortho tri are used as one of the simple ways to treat endometriosis and actually help in decreasing the disease.
There is no available literature as far as my knowledge is concerned and even in my clinical practice I have never encountered a patient who has taken antiepileptics and Oc's together to have developed endometriosis.
Hope this is of help and please do not worry.
Thanks for using HCM.