Epilepsy&folic acid

Nazaret
I have a type of epilepsy called absent seizures,so even pregnant im on my meds(lamictal).I started taking my prenatal vitamins not long ago and now my dr recommended me to take 4mg of folic acid a day(4pills)to protect the baby from any neurologic desorder.I told her that the prenatals that Im taking already have folic acid and she said that I have to take 4x more than a regular pregnant woman bc of my condition,she even mentioned that I can quit the prenatals whenever but that its important that I start yhe other pills :( Ive read that 4mg is the max you should take a day.I dont know what to do,I didnt have this issue with my last pregnancy,it was a different dr too.Can anybody help me?