Congrats on the Loss!!
i was gonna say it could be withdrawls, but then i saw that it was in your 3rd week. the first time i did this WOE i had heart palputations but im not sure if it was related to my change in diet or not. If it gets worse, or your worried about it, i would see your doc, there might be another reason for them, if its not too severe maybe just wait another week see if it gets better. You could also try moving up to OWL adding more variety to your diet maybe that will help?
Hope all works out for you