Tmi bowel movement

I normally only have a bowel movement once a day. First thing in the morning. As of lately I have been going twice a day with a little less then a normal bathroom break. So total it's a little more. I've also had and off and on upsate tummy. And cramps. I can't figure out why. I was thinking about trying some fiber and see if mabye my body is just trying to clear everything out. Would it bad to try the fiber? Should I just go to see a doctor?