E.B.
This is probably not one of the posts you want to read, but my miscarriage started with something that was a lot like losing my mucous plug when I went into labor with my first. Then I had a ping, popping noise, very similar to my water breaking with delivery, and then I bled profusely--there was NO WAY to mistake it for anything else. But--I had no cramps the whole time. I wound up in the ER because I was bleeding so heavily, about to pass out--and still not cramping. The doctors were a little confused by that, but I was in no pain...I hope most of the other posters are right, though, and it's nothing!!! Good luck!