Short cycle

Aya

Ok so I ovulated on the 17th which makes me 3dpo now. I’ve been cramping on my right side, the right side of my lower back, in my uterus on and off, stomach pains/ gas(tmi) , in my thighs, I have not had an appetite, feeling nauseous on & off, I have been going to do the #2 a lot which usually before AF I have a very limited bowel movement. I have never felt this bad before AF. AF comes on 12dpo-13dpo . What could be the issue?