Supervisors wife is now cyber attacking me because of my pregnancy

His wife keeps posting on Facebook ecard of rude pregnancy comments. I can't really prove it's towards me, but ever since I've announced my pregnancy at work my supervisor has been saying negative comments towards me. At this point I've been really respectful to them about their miscarriages but I'm not going to tolerate the rude comments. I'm sticking my middle finger up from now on.