Have you had any "burning" sensation in your lower abdomen?

I have this non-stop burning/warming sensation in my lower abdomen....I wouldn't say it *hurts* but it's like a dull achy-burning feeling....I've googled this and everything I've read says this is normal occasionally as the uterus grows and stretches but mine in literatally non-stop, 24/7. It's very uncomfortable and doesn't seem normal. I've felt this one other time and it ended in miscarriage.