It's normal to go for a week or two (or three or four) from time to time without losing weight. I think you're right, though, it does sound like you're not getting enough calories. I know it sounds backwards, but if you don't eat enough calories, your body gets scared it's going to starve and then it holds on to everything.
I can guarantee you, though, that you have not stopped losing at less than four months out. If stalls stress you out, give yourself a break and stay off the scale.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.