bad cramps in second trimester

I am having pretty bad cramps and I am 13 and 1/2 weeks. It's making my back hurt as well. I have felt minor cramping since before I was pregnant (thought it was my period), but it's really uncomfortable today. On a scale of 1-10 it's a 5 or so. I am not doubled over but it definitely hurts pretty bad. I haven't had any bleeding or spotting. I worked out this morning at a boot camp, but have been working out there for the past month and have done much harder workouts. I didn't jump or anything. But I am truthfully concerned. What do y'all think? 😕