Shower 31 weeks vs 33 weeks

Two choices I have, I don't want to do 33 weeks BC I know I will be huge and uncomfortable but my MIL works better with 33 weeks BC she has plans on the 31 week date. She hates showers, weddings and always leaves early and said not to change bc of her. Someone please give me input! I also want to have plenty of time to get everything ready for the baby, and in case she came early. I am a curvy girl and already feeling huge at 20 weeks and my backs killing me. 

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