Am I constipated, stressed, or having period cramps?

I have been going through a lot today. I finally decided that it was time for my bf and I to take a break. It hurts so bad and I miss him so much. However, I’m feeling really bad pain in my lower torso, it feels like my uterus but it could be my intestines too. I start taking the “period pills” on my brith control starting tomorrow. My period is due soon, but right now I feel constipated. I keep feeling like I need to poop, but I’ll sit on the toilet and nothing happens. I’m really frustrated because I don’t know what the problem is. Is it stress from taking a break? Is this a normal period symptom? Or am I constipated??? What should I do? It’s very painful.