Is this ok

So I take keppra seizure meds 500mg twice a day and got a new refill it was 750mg so I took one last night and one this morning because I don’t want to get sick and I messaged my dr asking if that was correct and they messaged me back n said they sent a new prescription 500 mg. I’m like 🤦🏻‍♀️ do y’all think I’ll get a seizure from going up and down the dosages.