BSOHF

I last went to my dentist 5weeks ago, I go for a check up every 6 months. Last time I went he confirmed that my wisdom teeth were coming through, im 17 too. With in the past two weeks I have noticed my front teeth have become very cramped together and are starting to push out of line, Im worried it could get worse, and I might need braces, should I book an appointment to go see my dentist as soon as possible? becuase once I get to 18 I will have to pay lots of money for braces to sort my teeth?