Pregnancy discrimination at work?!

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So I have this boss.... 🙄 he has been on thin ice so many times for things he has done in the past- he doesn't get along with anyone on my team except for me. Well, I think I am finally fed up--- this week (I'm 37 1/2 weeks pregnant) he decides that he is going to assign another team member to all of my projects. Basically I'm the only one on my team who does tech stuff- and he thinks it would "help me" to have someone else be assigned to run the projects-- I've never missed a deadline and I'm the best employee there who does his job half the time because the entire team hates him.... i never asked for help- I don't need help, but for some reason he is taking away certain job responsibilities from me..... I feel like this is totally discrimination--- thoughts?!

** just clarifying-- this is not a temporary thing... this is a permanent thing that he wants to do