One of the things I love about SBD is that you don't need to count calories. I didn't count them at all in my first 1 1/2 years on the plan, and I lost 128+ pounds.

I find that the restrictions on high-caloric items (like nuts) and sweet treats, plus my personal restrictions on items that I tended to overeat (like starches) helped keep me on track enough that there was no need to count calories.
Great new avatar, Jenny! You look lovely.

In the book, Dr. A explains that it's much easier to stave off a drop in your blood sugar (and the corresponding ravenousness) than it is to deal with it after it happens. That's one of the reasons he suggests eating every three hours. I've had several occasions where I got to experience the truth of his words. It's a total mess when you let your blood sugar drop too low. So I highly recommend sticking with your plan and slowwwwwwly adding things to it. In most cases, you aren't really "adding" much. For instance, while you may add a WW bun to your lunch, you may eat less vegetables in response.
Check out the
What's your P2 Combo? thread for tons of great information and ideas about how to transition into P2.