What's up with these stomach pains?

A week ago I experience severe stomach pains while I was out with my friends. I attributed it to not really eating much during the day. I was just having a good time and not thinking about food- not purposefully starving myself. I ate some pretzels and drank seltzer to ease the pains, but I wasn't able to eat much until two days later. During that time I noticed that I was spotting 2 weeks before my period. That lasted for a few days and now I have cramps. They aren't bad. Just kind of dull pains that are more annoying than anything. Does anyone have any idea what this can be? I'm not ually active so that rules out a few things.