from pill to IUD

first off i was on the patch for 2-3 years ages 15-17 from then to now i’ve been on the pill, i just scheduled to get my first iud, leaning towards the kyleena but not 100% sure yet (would love to hear others thoughts) i was wondering if anyone one else has had this transition!!! i’ve heard some say i should get while i’m on my period which i can see and i’m scared it’s gonna mess up my cycle if i don’t get it on my off week. thanks in advance!

lowkey just think i’m just nervous about it!