I was cramping on my right side and when they did my u/s they said that was the side I ovulated on that there was a small cyst from ovulating, maybe that's the case with you. I cramped on and off till I was 9 weeks and I'm 16 weeks and going strong :)
I know how you feel I'm in the exact same boat. I know it's hard to not think about miscarrying but I also agree that if you don't start bleeding then its fine. You will experience some pain specially since your uterus is growing and your body is doing a lot of changing right now. Also I have heard that while pregnant during the first few months you can experience a bit of pain around the time your menses usually came. Best wishes to you and remember just rest and don't overdo it and try to not stress yourself out about it. If you do however start bleeding go to the ER and get checked and if you don't then just chalk it up to growing pains.
I say your fine, don't stress out, especially if you're not bleeding