5 year old being clingy

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My newly turned 5 year old has been sooooo clingy for the past few weeks. All he ever wants to do when I’m home is cuddle and be attached to me. Normally that would be fine but I’m 34 weeks pregnant. I have SPD, my morning sickness is coming back, and I’m anemic and literally the last thing I want right now when I’m exhausted and in so much pain is to be touched. I’ve tried explaining to him that mommy’s tired and hurting and can’t cuddle right now but he throws an absolute fit. But it’s driving me crazy. What can I do??