am I just crazy

I have a heavyish feeling in my uterus. like it feels almost like a balloon being filled with air I guess. I've had some things that feel like stretching pains in my uterus. it feels uncomfortable to walk upstairs because I'm so bloated and slightly cramps. I'm 8dpo. is this normal. it's in the center of my uterus. two days ago I felt a pinching cramp sensation on the right side of my uterus that lasted for hours.