Every miscarriage is different. My two recent ones were completely different. I've even had a bleeding scare this pregnancy and everything is fine so bleeding doesn't always mean a m/c is happening. I would go to the er or wait until the bleeding either stops or picks up. If it stops I'd call my OB first thing in the morning and ask to be seen that day for possible m/c. If it picks up I'd go to the er to see what is going on. Some times there is cramping and sometimes there isn't. Listen to your gut and do what will make you comfortable. If it is leaking onto a pad personally I'd go right now. I hope everything is fine and I'm praying you and baby are ok.