I'm a vendor on a couple of markets, and I make a consistent practice of tumbling my coins between market and my electrum wallet. Unfortunately on the latest occasion I had a moment and forgot to do so, sending them straight from market to electrum.
Has this compromised my electrum wallet? I know electrum utilizes different receiving addresses and I had never sent any BTC to that particular address previously, but is the transaction still able to be linked to the rest of my transactions/wallet via the blockchain? If so I'll generate a new seed and start again, we all know how Ross' Gmail address came back to bite him all that time later - only takes one slip up!
your probably ok, but you can transfer your btc to another one that electrum gives youe], then burn your current, if your really paranoid.