I had a miscarrage at 12 weeks and it was nothing like labor in my experience. I had no drugs for my first birth and the pain was much more intense.
The m/c was painful, like a bad period for me. I think I may have taken an IB profin or tylenol for the cramps from the m/c so it may have dulled the pain a bit.
my last miscarriage was extremely painful and I likened that to labour pain, it felt worse for me as I knew I wasnt getting anything out of it, ie, a baby, so for me the pain was harder to handle, I have no pain relief during labour, and I consider that pain a positive pain as each contraction brings me closer to meeting my baby, I dont know if that makes any sense to you , but the pain was the same, but labour pain has a good outcome :)