Possibly Pregnant?

Hello! I’m four days away from my expected period but I was wondering if it is a good possibility that I am pregnant? I’ve been having headaches a few times a day. Nothing to bad but it starts in one area and moves to another often. Some lower back pains. I cannot bend as far back when I stretch and my uterus pelvic area just feels weird and really bloated. Any thoughts and any first indication stories would be greatly appreciated!