sure! they can also get more expensive! If you spot a good deal, jump on it....bear in mind, advance purchase restrictions mean the further out you book, the cheaper it is, normally. Feb 22nd is 3 weeks away. If you wait till day of, you might have to pay unrestricted (highest) fare. Not a gamble I would take.
tickets will typically jump three weeks before a flight and then again two weeks before a flight. they may fluctuate once you are within three weeks but typically will only increase when you are within two weeks. to cut through the deals, you should check out http://www.travelcuse.com to book your trip. the site is an aggregator which means it takes offers from various online sites and shows you the best deals. good luck!