I tried to do Atkins while I was nursing and it totally messed up my milk supply and also I couldn't lose more than the initial water weight. I decided to hold off until I finished nursing. Some people don't have that problem, but I did.

I doubt your nursing is keeping you from ketosis though. It's possible if you're drinking a lot of water that it's just not showing up on the strips. That can happen. Also if you could post a menu, sometimes there are hidden carbs that people don't realize.