Is this spotting or just my period?

I did not have sex, but I did other things like giving a BJ, making out, fingering, licking, dry humping, and all that. We were wearing thin clothes, so I was thinking that everything is fine. My period was late, but I've been stressed lately so I assumed that stress made it late. This morning, I had really bad cramps to the point where I threw up. This is normal to me, as I always get bad cramps right when I'm about to start my period. Once I checked, I did see blood. I was really happy, until I realized that it somehow stopped. The blood wasn't just spots of blood, it was actually somewhat light to the point on where I have to wear a small pad. The color was dark red and some of it came in "clots" of blood. It then dried to a dark red/brown, and that's when I started to worry. Is this actually my period, or is it spotting?