What to say?

Brianna • Hello! I`m medical assistant, book nerd, movie buff, collector of purses. My hubby and I are TTC our first child!
I'm 23 and married for a year. My husband and I are TTC our first baby, and anytime I mention our future as parents my mother always says "please tell me you aren't trying right now!" It's really dragging me down. We are more than ready and desperately want to start our family! What do I say to get my negative mother to stop and just let us be!!