Virus/ Malware?

I was on tumblr about 2 weeks ago, I clicked on a link to view a picture and the link instantly took me to a **** site and said my iPhone had now been infected with a virus. Immediately I cleared everything (cookies,history etc). Now tonight I was on my browser and another pop up showed up saying what's stated in the screenshots I took below. Should in be concerned? This has never happened to my iPhone before. How do I fix it? I don't want to lose all of my pictures and other info!! Please help! Thanks.