I have exactly the same problem and only realised this now as I did not get an error message or similar at all. I type the URL and it tries to load for a long time and in the end throws an error message saying the website took too long to respond.
I am using 123reg as my Domain host but nothing seems to be odd there and nothing comes up in shopify either! Can please someone help as soon as possible?
Thanks a lot!
Update on this, as it happens I am based in Italy and have been trying it out using WIFI and have just seen Shopify's status update that there currently are issues with several internet providers from Italy. They are trying to resolve this, but to explain that this is the reason the website did not load for me, because I am using this provider. Many thanks, Johanna