I think this post will be good (well not good) for future reference if a lovely lady wuch as everyone on here is going through a miscarriage.
My first miscarriage was at 7 weeks and it didn't hurt much. It felt like a small pinch and then a 'release' like all the tension in my abdomen just went. I knew that second what was happening. I took two painkillers and let nature take over, other than that, it didn't hurt. I felt sore for two weeks after.
My second miscarriage (June) was at 16 weeks pregnant. I went into full blown labour whilst on the toilet (strong contractions, the sweats and intense pain), again I felt the pinch and relax of my womb, but much stronger this time. I went to the hospital and they did nothing. I went home and went through labour without painkillers. It was bareable in physical pain but definately not comfortable.