Lost USDT after approve on Uniswap


I wanted to swap my USDT for ShopX on Uniswap. I had my USDT in my metamask wallet and was connected on Uniswap. I had to approve so that I could swap. Appently I made a mistake, now my USDT is gone. Hopefully someone can help me understand what happened and if I am lucky how to solve it.
Thanks for any help!