it sounds like round ligament pain to me... one of those unfortunate things the you really just have to put up with in pregnancy (and it will get worse, sorry!). although a supportive tummy band will definitely help - especially if you are going to be walking a lot during the day.
The round ligaments help support the uterus so as your uterus gets heavier, they have to stretch and are under a bit of strain. It causes a sharp, stabbing kind of pain. Does that sound like what you've been having?