£0.01 out notification from my hsbc account, but when i check transactions, it’s not there?

i undertsand that usually when £0.01 transactions are made, it’s to verify something like a subscription (i have no subscriptions to anywhere btw), a bus ticket or to see if the card is still working. my bank balance has not gone down as i know that these are usually reversed instantly. however, this time it was different. it said intl/itl (i’m not too sure i can’t remember) on it, meaning it’s an international transaction i think? this is where i’m getting worried. i haven’t left the country in over two years. i only have a couple quid in my bank rn but i’m still slightly worried. another family member of mine recently had his card details stolen and had some money taken out, and i’m worried that it could’ve happened to me recently as i went out and did use my card frequently. i had to put my pin in at only one point, but it could’ve happened anywhere. i don’t know what to do and i’m in need of advice. should i freeze my card before any money can get taken out? i’m contemplating on talking with the help line thingy to see if there’s anything but i don’t know.