Stay on the pill or move to IUD?

I've been on microgynon for about 8 months now and have only recently started having sex. I trust my partner entirely and he's taken an STI test so we have had sex without condoms a few times which left me nervous as obviously the pill isn't 100%. Both my partner and my mum have mentioned I should move to the IUD. I'm nervous to change from the pill as I routinely take it and so my body is used to it. Anyone any experience or strong opinions on this?

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