Some IUD Confusion

Backstory: I recently started a job as a nurse practitioner at a women’s health clinic.

me: I inserted an IUD today!
mom: what’s that?
me: its like the copper one you had after you had [my sister]
mom: oh! you found someone to have sex with?
me: no mom. I put one into someone else at work. crazy..
mom: Ahh.. I thought you got it and I was happy for you.

Love, Mom