That quick?

Is it possible to get past the heavy bleeding and hard cramps in a couple hours? I started spotting Sunday night, bleeding Monday morning, and then yesterday morning I woke up having contraction like cramping and passed a lot of uterine material and blood in a short period of time. Since then cramping has been minimal and I'm still bleeding just not much more than when I wipe. Is this the calm before the storm or am I through the worst?