Baby shower how soon is too soon?

My mother in law and I have been having a disagreement about when to do my baby shower. I'm currently 20w 3d pregnant. A little over a month ago my MIL and I sat down and picked a date for my shower. We decided that Nov 12th would be good to avoid the holiday rush and to avoid January when I'll be way pregnant and not feeling like partying. Im not due until February 20th. We'll just the other day she told me that I'm not showing enough to have my shower at 26 weeks like we planned and that in her book it's rude to have the shower before 7 months (I'll be 6 1/2 months). Ive already sent out 30 invites and been working on fall decor with my friends. When are all you February mommies planning on having your shower?