I am soon to enter my 28th week into pregnancy. This is my first so I'm nervous. Can u help me? All day I have been experiencing on and off again back pains, now it is 4 a.m and I feel like my stomach is tightening along with the feeling of bowel movement, although I did have dirrahea once since the backaches started. Should I be concerned this is preterm labor or just my nerves. I really don't want to go to the hospital if it is just in my head.