I have this too. I also had a mc in 2009. I am a little worried, but I just have a good feeling about this. everything I seem to experiance seems normal from what i've been reading. Best of luck to you :)
I had this at 4 weeks, still have it at 6 weeks now, if i lay down or relax all seems good, but the minute i move i feel pressure, I had cramps for 3 weeks until now where they have stopped, but unfortunately for me I think I have a "threatened miscarriage", been bleeding etc.... If you have any sign of bleeding, be it brown, pink or red associated with or without this pain, head to the doc, you can never be so sure.