I’d be careful about completely trusting any AV to give you any certainty that you aren’t infected.
As I mentioned in another comment, Pegasus is comprised of many different exploits. So just because Bitdefender can detect some older Pegasus variants, doesn’t mean it can detect all of them.
In fact it’s quite unlikely they can detect the latest variants.
This is like the epitome of the XY Problem.
https://xyproblem.info/