Knowing baby gender but can't tell anyone.

So our original plan was to have a gender reveal at our baby shower. But when I went to my aultersounds baby moved butt up and I ended up seeing the baby's gender. I am not supposed to know so I can't tell anyone what I seen. But since we got the aultersounds done everyone has been pushing for us to do a early gender reveal party. Only problem is we already bought everything for the baby shower. What do u all think we should do? I know it my choice in the end and only what I want to do matters but I'm wondering what others thinks.