Need advice on parents sharing pictures on Facebook.

So I'm 9 weeks pregnant, and am worried about how MIL will take pictures and share them to her wall.

That normally wouldn't be a problem except for the fact that my OH ex accused him of raping her, (took her to court and she admitted she lied, MIL knew.) And I'm not comfortable with MIL sharing photos that someone who accused my OH of raping her could see.

Am I wrong? Over reacting?

I know she will "steal" the pictures and post them if I don't say anything, but it's not like I can say, "block her or you won't get pictures of your grandchild."