Weird symptoms?! (TMI, no pics)

I am waiting to take a test until the 5th. My AF is sure the 29th... I had pink and brown spotting. Last night I was constipated SO BAD!! My stomach hurt to the point I was crying and couldn't sleep. Then today, I'm still having pains, but my stool is loose. Is this a possible sign of pregnancy? I don't remember having this with my first...