First, congrats on the gains! How much did you gain?
When you take a break that's as long as two weeks you really should ease into your new routine and gradually build up the intensity and slowly adding new exercises. You've probably de-conditioned yourself a bit and your giving your dick even more stress than it's used to, especially after a two week break. So it's probably a mild sign of overtraining or if there's no pain just a mild burning sensation it could just be your dick reacting to the new exercises. Remember that "pain" should not be part of your PE vocabulary!
Either way my advice is to take it easy on yourself and go slow and gradually when you add new exercises.
Another good idea would be to start a progress log, that way other members can easily cheer you on and help will be easier to get if need be. It will also be much more rewarding for yourself to be able and track your progress.
Best of luck!