Good thing that you know the fund should be transferred before you claim your BCH. Here is the guide from Electeum on how should you claim BCH. Also, choosing a hardware wallet like Ledger was the right decision. Just do not use your old seeds or private keys after claiming BCH from Electrum. Because you are going to input your seed/private keys to another wallet which is a fork of Electrum. Just create a new seed if still you want an Electrum wallet. Otherwise, you may use Ledger without hassle. Don't forget to keep safe your seed in multiple places and don't store it on any online/offline machine.