Normal?

Hi mummies! My menses came 6 months PP. Last month was my first cycle, my milk supply dropped tremendously throughout the cycle but luckily it was only 3 days. This month, my cycle was 1 week late. And during this 1 week, my milk supply dropped tremendously again, i have yet to start mensturation. But once i started, my supply came back. Is it normal? Will it be like this or will it change again? I dont keep stash because i don't have space in the freezer, and getting a stand alone freezer is quite pricey.. even for a second hand ?(@150) any mummies wants to sell their freezer? But my budget is only $100 ?