Cramps or IBS?

Abby

I’m 11 and have been diagnosed with IBS since I was 8. I have several <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> because I have only had 2 cycles so far and want to see which one works best. One app says I’m supposed to start in 2 days, and one says I’m supposed to start Wednesday. I’ve had BAD stomach pain for a few days. Is it IBS or cramps?