I had to wonder if your three swans were the same three that I saw flying over our house, here in Washington State, but the ones I saw were flying south. The thing that struck me about these swans was that they are the first that I ever remember seeing in many, years. In addition, I saw a flock of white swans (66)about a month ago, flying over the Columbia River and four more swimming at the foot of an island.
I spend a lot of time outdoors and although I am not a didicated bird watcher, I do take particular notice of large birds and as far as I can remember, I've never seen anything like the swans that I've seen so far this year. I take it as a good omen.