IUD bleeding, miscarriage or period?

Elina

So..

Got a IDU on the 2d. Had brown/bloody discharge for a few days and then it stopped. A few days ago, I bled during sex but it's not that uncommon.

This morning I had brown/bloody discharge again and it has spit out during all days. Got som cramps before but my period isn't due until 8-10 days?

Why am I having cramp if it's just more bleeding from the IDU?

If it's my period, why doesn't it look, smell or increase like my period does?

If it's a miscarriage, how will I know?

This is confusing 😂