anatomy/gender scan!!!

Okay so i’m going in on Saturday to find out the gender of my baby, but a b*tch is impatient and i can’t wait a week while someone else knows. So my SIL and I who are throwing the gender reveal are planning to have it also on Saturday, that is if my baby wants to open it’s legs for me. My question is, is there any way to make the chances of me being able to get the gender higher? I’ve heard of drinking a cup of coffee but i’m not sure. If my baby wants to cross its legs though, i’ll be okay there is always next month!