nuvaring: how far in does it go?

Katie • a student kicking long distance's butt
I just put in my first nuvaring. I folded it and pushed it in but as soon as it went in it unfolded into the circle and I could only push it in a little more until my finger kept slipping off it. My vagina is curved inside but it's basically as far as the mid-knuckle on my middle finger. So about 5-6 cm. I'm sure it's far enough to work properly and I can't feel it so that's good but is it far enough to last for the three weeks? Those who use the nuvaring, did you start out like this too? Does it get deeper with practice? How deep can you push it in and does it sound like I'm doing it the right way?