Lost litecoin when transfering to litecoin core. I think

OK I think I messed up a transaction.
I purchased a litecoin from bitbargain and tried to transfer it to my litecoin core (Testnet) and didnt click on recieve or put in the ammount I just copied the recieving address and pasted it into the bitbargain transfer bit.
I cant see any coins anywhere.
Is there a way of getting them back?