Progestrone levels cause my epileptic seizures...?

and well i could potentially be pregnant and know the levels get even higher then, i feel very weird like im about to fit but i dont. i am on epileptic medication wich has controlled it for over 3 years but now im potentially pregnant im worried the tablets wont be enough as the levels are so much higher in pregnancy, thing is its a week yet until my period is due, i normally experience extremely tender breasts prior my period about 10 days before hand, its only 6 days until im due and my breats feel normal, this is why im worrying im pregnant?