What if i send my Btc to two different Ledgers, do i get two private keys?
To be on the safe side you should follow the steps already posted. FIRST send your bitcoins to your ledger. After this Step you already secured your BTC.
From now on you "only" risk your BCH when importing your private keys into a different software. But if you use a reputable wallet, nothing should happen.
Your ledger is a HD (hierarchical deterministic) wallet. This means your wallet creates addresses (private/public key pair) based on your seed and a variable/counter (to put it simply).
So every ledger wallet is holding multiple adresses.
You can get a second ledger and initialize it with either (1) the same seed as your first ledger or (2) with a new seed.