Dull pain

I have a faint but persistent pain in my abdomen. It's on the left side and my lower back hurts a little. I know it's probably digestive or something related to that. I think I've felt this pain before (when I wasn't pregnant) but of course now that I'm pregnant, I'm paying attention to everything my body is doing. I had trouble falling asleep last night because of this pain. I woke up this morning and it was gone, but it's back now. It could be anything, and I've read that a little pain in that area is normal during the first trimester, I just can't help but worry. I'm going to stay positive and try my best not to worry.