Ttc with epileptic boyfriend

Kathy
My boyfriend and I have been ttc for about 4 months and still no luck. We both have 1 child each from our previous marriages but we are worried that we will not be able to have another with each other because of his epilypsy. He is on 100mg of Dilantin 4 times a day for his seizures and ive read online that his condition and medication can cause fertility problems. Does anyone know otherwise because I really want to keep my hopes up and it just has gotten more and more harder to do so as the months go by and nothing has happened for us. Thanks for reading!