Someone sent bitcoins to my address
But when I look at my address now, it has been changed to
Will the bitcoins still arrive at the first address?
My guess, without knowing what exactly you did or which wallet you are using, is that you clicked again on the "receive bitcoin" button. Every time you do that a new address is created. This is for security/privacy reasons (you should not reuse addresses).
Anyways normally all addresses (actually their corresponding keys) created this way are automatically saved in your wallet so you should be good.