HELPPP

Guys im freaking out , im 17 weeks pregnant and when i went to the bathroom not too long ago there was a good amount of blood in the toilet , i havent had blood since i wiped it away but im cramping , slight but consistent cramps. Im on my way to the doctor but has this happened to anyone before and had a okay outcome? I had a miscarriage in october at 10 weeks but the signs were just major cramping , this time there is blood