I have the same thing and I'm 5 weeks pregnant. Usually happens when I'm sitting or laying down not moving around and it's not all the time. Freaks me out too. I'm so happy that everyone is saying it's normal. My dr said the same thing to me. Congrats:) yay for July 2015 babies.
Also my dr told me to call if the cramps were focused more on just one side because that could be a sign of an ectopic pregnancy
This is my first pregnancy as well and I had severe cramping for like 3 weeks. To the point where I would almost cry. Drs said it was all normal. Just everything moving, stretching and getting into place. I hardly get any cramps anymore and I'm almost 13 weeks. I think it stopped around 6 or 7 weeks.
I am 16 weeks now and I went through the same thing! I had really bad cramps and discomfort. I was so scared. . I still get cramps but everything is fine. It's just your uterus stretching and growing.