Is this normal or not????????

I am 26 weeks pregnant. I can feel the baby move up in my ribs. Sometimes I can feel him in my ribs and pelvis at the same time. I can also feel real bad pressure sometimes like he is stretching and doesn't have enough room. I also half Braxton Hicks contractions and I can feel the top of my uterus about an inch below my rib cage (I can tell because my uterus gets really hard). If I eat at all I feel like I'm either going to explode or vomit. I feel like I'm 36 weeks instead of 26. Is this normal for a 2nd pregnancy? Oh, and sometimes when I stand up too fast it feels like someone is stabbing me with a knife.