Newbie here! Bought my first Diva Cup. My period is gonna start tomorrow. I tried a dry run with a size 2 and could not get it to fit whatsoever. I am 29 with 1 child. So I went and bought a size 1. Really hoping I can get this one to fit. It keeps popping open to early for me. Is it ok to boil the cup in a "non stick" pan? I couldn't find any pans without a non stick thing. Don't want the coating to ruin my cup. Thanks so much! Any tips to make it fit, besides the different folding techniques and lube would be wonderful also!