Pop up saying Virus on my iPhone

Hi

i went on a website for airport transfers and a pop up said my iPhone has a virus and I need to click on the button to install an app - it looked real - but I didn’t install - I came out of it - however when I went back on my phone the warning appeared again so I clicked on the cancel button on the pop up - now I am freaking out as I have read this is a scam and should not of clicked on anything! Help!