I've had seizures in the past, only during pregnancy and my last child was born 4 years ago. Since then I have had 2 episodes. What could this be?

Need an evaluation. With these last two seizures it sounds like you need a thorough evaluation. Contact a neurologist.
May be epilepsy. At least 1% of the population has epilepsy. Most are well controlled and rarely have a seizure. Common settings include pregnancy, toxic states, infections, trauma, stress that can bring out a tendency for seizures. You do need a thorough neurological evaluation. Chronic medications may not be necessary, but appropriate management should be discussed with your doctor.