That's fine. It doesn't matter. It's not an indicator of labor. It can grow back.
No they usually make you wait for bloody show losing the mucus plug means nothing at all people lose it early on and grow it back
No. There's no need to go unless you're in active labor or your water breaks. (Or the obvious of bleeding, etc )
It can regenerate are you leaking or having contractions
No it's normal it regrows and you can lose it multiple times