You could have used multibit hd (sometimes even 15 word mnemonic) or schidlbach as well.

Try to enter your seed words, click on options and check bip39. Next choose “legacy (p2pkh)” and set the derivation path to “m/0′”

or if you’re using the Schildbach app, you can use its dedicated tool https://github.com/gurnec/decrypt_bitcoinj_seed (if you have encrypted wallet backup file)