I did a transaction 2 days ago.

http://blockchain.info/tx/33bce9a9251505167fa398acd402267997ba460b1e060194831006299d1ad3fb

I send some low amount of BTC to this address: http://blockchain.info/de/address/194Mr3uhK6Dq9cvU6tjvGZCLtiTftk4Hxd

But unfortunately, it does not get confirmed.

What happens to unconfirmed transactions?

Will they be cancelled after a certain amount of time? Will I get my BTC back?