The last two of my miscarriages started with bright spotting (for no reason at all), followed by bleeding heavier than a normal period for a day or two. In both cases, I had already known I was preggo. The first one, I didn't know I was preggo, but since we were TTC, I was watching my temps, etc, and right about ovulation time, I started bleeding heavily. After blood tests, the dr. confirmed it was a miscarriage. I didn't have much cramping for any of them.