Has this ever happened to anyone? Health question!

My periods are usually very heavy and last 7 long days. This time around my period was very light & only 3 Days. My face is breaking out VERY badly like it did when I was in junior high, like painful big acne. I’ve gained 10 lbs in the past month alone.

I’m 22 years old & I’ve been on the copper IUD for 3 years, so no added hormones.

I’ve taken a pregnancy test just to check, so not pregnant.

What else could be going on with my body??? Has this ever happened to y’all?

I’ve tried googling it you know how that goes....