First time menstrual cup user

So after debating for a month now, I decided to give a menstrual cup a shot. I got the flex cup with the pull tab since it seems user friendly. I have used a combination of pads and tampons (tampons always leak on me, no matter what brand) and it gets very expensive. My question is mainly to calm my anxiety. Should I be worried about something happening like passing out or anything? I doubt I’ll have any issue, I’ve never had a silicone allergy but then again it hasn’t been inside me. Please be honest, I just need to reduce my anxiety😅