Progesterone Suppository

I had my <a href="https://glowing.com/glow-fertility-program">IUI</a> Sunday and my doctor prescribed me with Endometrin vaginal inserts. I started yesterday and I keep putting it in as far as I can go but I am worried it’s not far enough in. It doesn’t come out when I go to the bathroom and isn’t coming out in my underwear - should I be worried? Is it not going to work if it’s not in enough?