Bleeding after new IUD?

Megan

I just got the Mirena IUD today. They told me I might have light spotting after for a few days. They gave me a medium pad to wear after. It's been a few hours after I got my IUD and the pad is almost full. I was out all day and didn't think I'd bleed that much so I didn't think to check. I did pass a clot the size of a penny. I never had an IUD before so is this normal?