There's no way your friends could all fit the CGC accurately -- there's no one chart :P

Every other site claims to be the REAL Chinese Gender Chart, or doing THIS form of astrology or THAT form (lunar signs/solar signs/"true" age/favorite color -- jk on the last one), and these all give different answers. So you could plug in all of your friends in another site that swears it's the best and get all opposites -- it's about as moldable as the moon signs!

But I 100% understand the hesitance. My DD was conceived in a New Moon phase -- sometimes makes me nervous I should factor it in more... but when I take a step back, I know I was doing a TEXTBOOK LE sway without trying to! So if I were to look at what things got my DD, it makes sense to do the one supported by a lot of different research and not what a piece of rock circling our planet has to do, haha.