How do I know if I have Bed Bugs?

Is there a way to tell for sure if I am being bitten by bed bugs? There are a few options to help you determine and answer this question. New traps on the market like the NightWatch and the CDC 3000 are good bets for a determination, although very expensive, but I wonder if people will balk at the price when being tortured by phantom bites. Then there is the option of hiring a bed bug dog. This is the probably the most effective way to get a negative or positive for the presence of bed bugs. I think that over the next few years we will be seeing alot of new traps and monitors come onto the market, but for now, our choices are limited.