I'm a citizen of Ukraine and therefore I need a visa to enter the US. 3 years ago I was going on a business trip to NY and so I got my b1/b2 visa which is valid for 10 years. Since then I've got a new job and moved to a different country - I have a work permit visa in the UK. Here I met my girlfriend who has a dual US/UK citizenship. We are going on a trip to the US for one week and will be staying at her parents'.
At first I was confident I can use my visa with no problem as it is still valid. But not I'm getting a bit worried about this trip - so many things have changed since I applied for visa 3 years ago. Is this going to be a problem? Is there anything I really should be worried about? Do I need to bring any documents with me to prove my purpose of visit? I only have my passport and return tickets.