Stomach ache?

Nala
So it's pretty normal to have a sore tummy when you're pregnant? I'm 12 wks and the last two days have been especially painful. Sometimes it just feels like bad gas and other times just a dull but annoying ache. 
Anyone else? What do you to to fix it? So far I've discovered that hubby back rubs help a lot. I don't know how, but they do!