Mystery eth appearing in my account

Some eth ($18.60) appeared in my account a while ago. I didn’t send it. I can find no record of the transaction on etherscan. I’d been on pancakeswap previously and have read reddit posts about people being scammed by interacting with tokens sent to their metamask wallet, so I’m pretty concerned, especially as I’ve been using this wallet to register for airdrops and will need to send eth to it for gas in a few weeks. I have a ledger connected to a second account on the metamask wallet also, if that’s of any relevance…

Anyone any idea what I should do? Any advice would be much appreciated.