If you are anything like me its not that you dont feel "motivated" but rather its bcos your head is used to the mind games. If you have only been "on plan" and actively working out for 2 weeks (unless I misunderstood that part of your post) that is way too early to be actually burnt out.
So either you need to pick different workout activities that you enjoy (so is it really just boredom or lack of interest in what you are doing) or you need to just do it. I know it sounds like its easier said than done, but if I let myself think
about working out too much I will rationlise it away and I can think of dozens of things I would rather be doing.
So, my suggestion would be as some others have said, on the days when you just dont feel like it and your mind is saying meh, just go sit on the couch, strap on your shoes and go for a walk or get on your bike or put on a yoga DVD and see how you feel. My mood and lack of motivation usually lifts if I just make a start
Oh and cute workout clothes dont hurt either