When to tell parents and students?

Li
I'm transitioning this year from teaching elementary school to advanced 6th and 7th grade math. I'm am quite young ( I look even younger) and I'm sure parents are already going to be a little hesitant about me. And surprise! I'm also pregnant, obviously. So my question is, when should I tell parents and students? I'll be 14 weeks when school starts and I'm not a very big person, so it might be quite obvious before long anyway. My principal and team lead already know and are super supportive, so I'll probably ask their guidance as well, but I thought it may be helpful to get additional opinions! Feel free to leave comments as well :) 

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