It’s alright to be anxious or afraid of the viva. Maybe you feel it, maybe you don’t; maybe a little, maybe a lot. It could be specific or vague, keep you awake with “what ifs” or sound asleep with uneasy dreams.
Do nothing and let it fester, or explore why you’re afraid and figure out what to do about it. Viva fear is a sign you recognise the viva is important. Once you figure out the root of your fear you can do something to help.
Fear doesn’t matter; your actions do.