I can't tell if this is my period?

Sarah
I'm 24 and I have very regular periods. They come like clockwork every month and I bleed for about 6-7 days. I started bleeding fresh blood a week before my period is supposed to start. I was a bridesmaid in my friend's wedding and I just had finals last week. But stress usually makes me start my period late NOT early. I'm just confused 🤦🏽‍♀️
Could I be pregnant even though I have a paragard (copper iud)?