Menstrual cup queef?

Sounds stupid but this is my first time using menstrual cups & this is the first time ive had my period after 5yrs (iud). I bought 2 different types from satusfyer (my fav sex toy brand) & im testing them out. I feel like my body is trying to queef it out because its a cup full of air that has suction cupped to my sides. I tried the C fold & the little dip fold. I seem to only be able to get it to pop open when I'm lying down. Does anyone else feel like their body is just going to shoot it out with a cough or fart or is that just me? The slightest tense & i can feel air moving in there. How do i fix that whilst also making sure the cup is open?