This is the second post I read recently about this. I had this too, but it was like 2 weeks ago. My dr. suspected appendicitis, so we were sent to the ER. It was nothing and it went away a few days later. If it persists for a long time, I would check with your dr. Because it's on the right side, that's why they originally thought appendicitis - so it won't hurt to get it checked out. She told me that appendicitis manifests itself in different ways in pregnant women, like the symptoms differ from those of non-preg. women. I did spend 6 long hours in the ER, but I at least got an ultrasound out of it and we learned the sex of the baby early :)
This was my Dr's first thought when I mentioned a similar pain... only I had my appendix out more than 10 years ago. Since then mine has migrated above my belly, right below my ribs. Sometimes it is so sharp that it literally will take my breath away and leave me immobile.