Hi there. Very sorry for your first two miscarriages--- but congratulations on this pregnancy. That's great news--- I'm happy for you.
It's actually common to have some cramping during pregnancy. Does it feel a bit like menstrual cramps? There is also something called 'ligament stretching" which are like pains. So, most likely what you're experiencing is completely normal and nothing to worry about. If the pains intensify, call your ob. You probably have a 12 week appointment coming up and talk about it then.
Here's an article on cramping during pregnancy that might help:
http://www.medhelp.org/pregnancy-health/articles/Cramps-During-Pregnancy-Your-Symptoms-Manual/1989
Congratulations again and best of luck to you