Could just be ligaments stretching out trying to get ready for the baby bump. and just drink plenty of water, I'm 34&1 and my docs got me drinking at least 8-10 water bottles a day.so drink all the water you can and contact your doc if you want to.
Drink lots of water and lay down, especially if you are urinating often, you don't want the risk of dehydrating. How do you feel other then that? Nausea? Vomiting? Dizziness? Any Pain?