Gender Scan Tomorrow!!

Heather
Hi ladies! So my anatomy scan is tomorrow and we want to keep the gender secret until our reveal party (on January 30th - I know , 10 days will kill me). For you ladies who didn't want to know the gender: how did you keep from seeing? Will the dr tell you to close your eyes if you ask her to give you a heads up? I truly do want to be surprised when we cut the cake!!