Should I peak or wait?

My cousin wants to do me a gender reveal. Tomorrow I have an app n I’m 16 weeks. She wants to come with me to my gender app which I am more than happy ... but i wanna know already I don’t want to wait another week or till when ever she decides to do the gender reveal after the drs app. Last time my dr let me peek at 15 weeks n told me 75% girl just because she couldn’t or didn’t want to guarantee anything to early. I did end up having a girl. So I’m hoping they’ll let me take a peek like last time. I’m so undivisive just because I wanna start buying baby stuff. Please help lol 😂.